CN112838232A - Full-through-hole metal fiber sintered body fuel cell bipolar plate and fuel cell stack - Google Patents
Full-through-hole metal fiber sintered body fuel cell bipolar plate and fuel cell stack Download PDFInfo
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- CN112838232A CN112838232A CN201911155557.1A CN201911155557A CN112838232A CN 112838232 A CN112838232 A CN 112838232A CN 201911155557 A CN201911155557 A CN 201911155557A CN 112838232 A CN112838232 A CN 112838232A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/023—Porous and characterised by the material
- H01M8/0241—Composites
- H01M8/0245—Composites in the form of layered or coated products
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/023—Porous and characterised by the material
- H01M8/0232—Metals or alloys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1004—Fuel cells with solid electrolytes characterised by membrane-electrode assemblies [MEA]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
- H01M8/2465—Details of groupings of fuel cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The invention discloses a full-through-hole metal fiber sintered body fuel cell bipolar plate and a fuel cell stack, which comprise a conductive separation plate and flow field plates, wherein the flow field plates are arranged on one side or two sides of the conductive separation plate and are made of metal fiber sintered bodies, and the flow field plates and the conductive separation plate are integrally sintered, welded or glued; according to the full-through-hole metal fiber sintered body fuel cell bipolar plate and the fuel cell stack, the metal fiber sintered body is used as the flow field plate, so that fluid can be uniformly diffused, the effective reaction area of gas is doubled, and the power density of the cell is improved; the metal fiber felt is used as a cooling channel of the cell stack, so that the cooling efficiency is improved, the volume of the cell stack is reduced, and the volume power of the cell stack is improved.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a full-through-hole metal fiber sintered body fuel cell bipolar plate and a fuel cell stack.
Background
Proton Exchange Membrane Fuel Cells (PEMFCs) are devices that directly convert chemical energy into electrical energy using hydrogen or purified reformed gas as fuel and air or pure oxygen as oxidant, and have the advantages of high specific power, high conversion efficiency, zero emission, and the like, and thus they have become an important development direction for solving the energy crisis. A typical PEMFC is composed of a Membrane Electrode Assembly (MEA), a Bipolar Plate (BP) end plate, a fastener, a sealing member, and the like. The membrane electrode assembly includes a gas diffusion layer, a proton exchange membrane, and a catalytic layer. The bipolar plate functional structure comprises a flow field plate and a flow collecting plate, wherein the flow field plate is a flow field channel of fuel and oxidant, and the flow collecting plate is a current channel between an electrode and an external circuit and collects electrons. The bipolar plate is a support framework of the fuel cell, occupies most of the mass and the cost of the battery pack, and has the functions of isolating and uniformly distributing reaction gas, collecting and leading out current, connecting each single cell in series and the like. At present, the graphite bipolar plate has good conductivity and corrosion resistance, but has the disadvantages of large brittleness, large forming difficulty, high processing cost, large thickness of the formed bipolar plate, low volume power density and insufficient competitiveness in industrial application. The metal bipolar plate has good electric and heat conducting properties, excellent mechanical properties and good gas barrier property, can obviously reduce the thickness of the bipolar plate, thereby improving the specific power of the PEMFC, and is considered as an inevitable choice for commercialization of the PEMFC.
The metal bipolar plate reported at present is mainly of a plate-frame structure, and comprises a gas inlet and outlet area, a transition area and a reaction area which are symmetrically arranged on the front surface and the back surface, and the stamping forming process can process complex flow channels, is convenient for batch production, and has already realized commercial application. Chinese patent CN1787261A discloses a stamped metal bipolar plate structure and a method for making the same, wherein a die stamping technology is adopted to process a fuel/oxidant gas channel, a cooling medium channel and a flow field region of the bipolar plate, and bosses and grooves in the flow field region are arranged in a staggered manner to form a ridge-groove structure for uniform gas distribution and current collection. The width of the flow field groove and the lug boss is 0.5-2mm, the depth is 0.1-1.0mm, and the thickness of the processed plate is 0.1-1 mm. The lug boss of the ridge-groove type metal bipolar plate is completely attached to the membrane electrode, so that reaction gas is prevented from contacting the membrane electrode, and the utilization rate of the MEA is about 50%; meanwhile, the stamping forming concave-convex die has the defects of large positioning error, warping of the formed sheet and the like, only the unipolar plate can be formed by single stamping, two unipolar plates are required to be welded for preparing the bipolar plate, and the process is complex. The patent CN206834255 μ discloses a PEMFC stack using the wavy membrane electrode assembly, the prior art adopts metal porous materials to take bipolar plates and gas diffusion layers into consideration, the metal porous materials are punched into the wavy metal gas diffusion layers and the wavy composite membrane electrode assemblies by dies, wave peak cavities on two sides of the MEA are used for reaction channels of hydrogen and oxygen (or air), and the current generated by the reaction is led out through metal fiber materials on two sides of the MEA. The design eliminates the bipolar plate in the traditional sense and improves the power density of the proton exchange membrane battery pile.
But the wave-shaped structure is easy to tear when a die is stamped, and the yield is low; in addition, the electrodeless plate fuel cell divides oxidant and fuel through the wavy membrane electrode, when a galvanic pile is formed by single cells, the galvanic pile is not in a series structure, but the anode is adjacent to the anode, the cathode is adjacent to the cathode, special leads are needed for dislocation series connection, and the assembly difficulty of the galvanic pile is increased.
Disclosure of Invention
The invention aims to provide a full-through-hole metal fiber sintered body fuel cell bipolar plate and a fuel cell stack, which aim to solve the problems in the prior art, the metal fiber sintered body is adopted as a flow field plate, so that the fluid diffusion is uniform, the effective reaction area of gas is doubled, and the power density of the cell is improved; the metal fiber felt is used as a cooling channel of the cell stack, so that the cooling efficiency is improved, the volume of the cell stack is reduced, and the volume power of the cell stack is improved.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a full-through-hole metal fiber sintered body fuel cell bipolar plate which comprises a conductive separation plate and flow field plates, wherein the flow field plates are arranged on one side or two sides of the conductive separation plate, the flow field plates are metal fiber sintered plates made of metal fiber sintered bodies, and the flow field plates and the conductive separation plate are integrally sintered, welded or glued.
Preferably, the conductive separator has a flat structure, and the thickness of the conductive separator is 0.1mm to 1 mm.
Preferably, the conductive separator plate is a metal plate or a graphite/polymer composite plate.
Preferably, the flow field plate is of a flat plate structure, the thickness of the flow field plate is 0.2mm-3mm, the equivalent diameter of the metal fiber of the flow field plate is 2 μm-200 μm, the fiber length is 1mm-50mm, and the porosity is 55-90%.
Preferably, the metal fibers constituting the flow field plate are titanium fibers or stainless steel fibers or copper fibers or high-entropy alloy fibers.
Preferably, a flow channel is further processed on the end face of one side, connected with the conductive separation plate, of the flow field plate, and the flow channel is processed by a rolling method, an overhead method, a laser sintering method or a grinding machine polishing method.
Preferably, the flow field plate is subjected to hydrophobic treatment, and a hydrophobic conductive film is formed on the surface of the metal fiber of the flow field plate.
Preferably, the flow field plate on the oxidant gas side separated by the electrically conductive separator plate is formed with a corrosion resistant conductive film by nitriding or carburizing or carbonitriding surface treatment.
The invention also provides a fuel cell stack, which comprises a series main body of a plurality of monocells, end plates at two sides of the stack, a cooling layer between the monocells in series, sealing gaskets between the monocells, the cooling layer and the end plates, bolt holes reserved for assembly and corresponding bolts; the single cell consists of the bipolar plate of the fuel cell with the full-through hole metal fiber sintered body, a membrane electrode and a sealing ring; the cooling layer is composed of a metal fiber felt, and the thickness of the cooling layer is 0.1mm-5 mm.
Preferably, the metal fiber felt forming the cooling layer is stainless steel fiber felt or titanium alloy fiber felt or copper alloy fiber felt.
Compared with the prior art, the invention has the following beneficial technical effects:
1. according to the full-through-hole metal fiber sintered body fuel cell bipolar plate and the fuel cell stack, the metal fiber sintered body is used as the flow field plate, fluid is uniformly diffused, the effective reaction area of gas is doubled, and the problems of wrinkling, corrosion resistance treatment, polar plate welding and the like caused by punching of a groove-ridge structure are solved.
2. According to the full-through-hole metal fiber sintered body fuel cell bipolar plate and the fuel cell stack, the metal thin plate is used as a gas separation layer to separate reaction gas, the thin plate is flat and convenient for corrosion-resistant surface treatment, and the metal thin plate and the metal fiber flow field plate are easy to integrally sinter.
3. According to the full-through-hole metal fiber sintered body fuel cell bipolar plate and the fuel cell stack, a Membrane Electrode Assembly (MEA) is kept straight and straight, wave-shaped processing is not needed, natural series connection is kept when a battery pack is formed by single cells, and the assembly difficulty is low.
4. According to the full-through-hole metal fiber sintered body fuel cell bipolar plate and the fuel cell stack, the metal fiber felt is used as the cooling channel of the cell stack, so that the cooling efficiency is improved, the volume of the cell stack is reduced, and the volume power of the cell stack is improved.
5. According to the full-through-hole metal fiber sintered body fuel cell bipolar plate and the fuel cell stack, the metal fiber flow field plate and the conductive separation plate are subjected to nitriding treatment or carbonitriding surface treatment, so that a uniform nitride layer is formed at each part of the material, the surface treatment cost is reduced, and the efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of one structural form of a full-via metal fiber sintered body fuel cell bipolar plate according to the present invention;
FIG. 2 is a schematic structural diagram of another structural form of the bipolar plate of the fuel cell of the present invention;
FIG. 3 is a schematic view of an assembly structure of a flow field plate with flow channels and a conductive separator plate according to the present invention;
FIG. 4 is a schematic perspective view of a flow field plate with flow channels according to the present invention;
in the figure: 1-conductive separation plate, 2-flow field plate and 3-flow channel.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a full-through-hole metal fiber sintered body fuel cell bipolar plate and a fuel cell stack, which aim to solve the problems in the prior art.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The first embodiment is as follows:
the embodiment provides a full-through-hole metal fiber sintered body fuel cell bipolar plate, as shown in fig. 1-2, the full-through-hole metal fiber sintered body fuel cell bipolar plate comprises a conductive separation plate 1 and a flow field plate 2, the flow field plate 2 is arranged on one side or two sides of the conductive separation plate 1, the flow field plate 2 only forms a unipolar plate when arranged on one side of the conductive separation plate 1, when in use, the two unipolar plates are spliced to form the bipolar plate (as shown in fig. 1), the two sides of the conductive separation plate 1 both form the bipolar plate (as shown in fig. 2), the flow field plate 2 is a full-through-hole metal fiber sintered plate made of a metal fiber sintered body, and the flow field plate.
In this embodiment, the flow field plate 2 and the conductive separation plate 1 may be directly or indirectly connected, the direct connection includes welding connection and sintering connection, and the sintering connection is that when a metal fiber sintered plate is prepared, metal fibers are randomly arranged on the conductive separation plate 1, and then sintered into an integrated metal bipolar plate structure of the metal fiber flow field plate 2 and the conductive separation plate 1; the indirect connection can adopt high-temperature and high-humidity resistant corrosion-resistant conductive adhesive to bond the two by a gluing mode.
In the embodiment, the conductive partition plate 1 is of a flat structure, the thickness of the conductive partition plate 1 is 0.1mm-1mm, and other contour dimensions are determined according to the design requirements of the battery; the conductive partition board 1 is a metal plate or a graphite/polymer (graphene and polyvinyl chloride, polystyrene, polypropylene, polyimide, polyaniline) composite material plate; the conductive separator plate 1 is used for separating oxidant gas and fuel gas, collecting current, conducting, supporting a galvanic pile structure and the like, and the separator plate material is required to have good corrosion resistance, air tightness, conductivity and structural strength; the metal plate material comprises titanium and titanium alloy, stainless steel, aluminum and aluminum alloy, nickel-based alloy, high-entropy alloy and the like.
In this embodiment, the flow field plate 2 has a flat plate structure, which facilitates good contact with the membrane electrode and reduces contact resistance, and the thickness is preferably 0.2mm to 3mm based on the design of reaction efficiency of the reactant gas. The flow field plate 2 is prepared by adopting a chopped fiber-cloth felt-sintering process, the equivalent diameter of metal fibers of the flow field plate 2 is 2-200 mu n, the fiber length is 1-50 mm, and the porosity is 55-90%; the flow field plate 2 is a channel for reaction gas, so that the gas is uniformly distributed and efficiently reacts, generated charges can be conducted out, and the flow field plate 2 on one side of oxidant gas also needs to discharge generated water out of the cell in time. The bipolar plate works in an environment with corrosive media at high temperature and high humidity, so that the bipolar plate needs very good corrosion resistance; the metal fiber forming the flow field plate 2 is titanium fiber, stainless steel fiber, copper fiber or high-entropy alloy fiber.
In this embodiment, in order to improve the permeability and distribution uniformity of the reactant gas in the flow field plate 2 and avoid the non-uniform phenomena of concentration of electrochemical reaction in the center of the battery, local water accumulation, overheating and the like, a flow channel 3 (as shown in fig. 3-4) is further processed on the end surface of one side of the flow field plate 2 connected with the conductive partition plate 1, and the flow channel 3 is processed by a rolling or overhead method, a laser sintering or grinding machine; the processing method comprises a rolling method, wherein the runner 3 is continuously pressed on the surface of the metal fiber sintered plate, and because the porosity of the metal fiber plate is high, the metal fiber plate can collapse after being pressed to form a groove, so that the back surface of the metal fiber plate is ensured to be planar, and the contact with the membrane electrode is not influenced; or an overhead method is adopted, when the metal fiber is paved into a felt, thick and straight metal wires are distributed in a metal fiber plate, and pores are paid out after the metal fiber plate is sintered to be flat to form a flow channel 3; the metal fiber on the surface layer of the metal fiber sintered plate can also be burned off by a laser fusing method by using a high-energy laser beam, so that the channel 3 for the reaction gas is formed.
In the embodiment, the two sides of the separator plate are respectively provided with oxidant gas and fuel gas, in order to improve the drainage performance of the metal bipolar plate on one side of the oxidant gas, the flow field plate 2 on one side of the oxidant gas is subjected to hydrophobic treatment, and a hydrophobic conductive film is formed on the surface of the metal fiber of the flow field plate 2; specifically, the flow field plate 2 is immersed in molten state polytetrafluoroethylene, naturally cooled and baked to generate a hydrophobic conductive film on the surface of the fiber.
In order to improve the conductivity and corrosion resistance of the conductive separation plate 1 and the flow field plate 2, the conductive separation plate 1 and the flow field plate 2 are formed into a corrosion-resistant conductive film through nitriding treatment, carburizing treatment or carbonitriding surface treatment. The method specifically comprises a gas nitriding/carbon method, an ion nitriding/carbon method or a carbonitriding method, and a method for preparing the corrosion-resistant conductive film by magnetron sputtering, PVD, CVD, multi-arc ion plating and the like, wherein the corrosion-resistant conductive film comprises noble metals such as gold, iridium, ruthenium, platinum and palladium, corrosion-resistant metals such as tungsten, molybdenum, tantalum, niobium and the like.
Example two:
the embodiment provides a fuel cell stack, which comprises a series main body of a plurality of monocells, end plates at two sides of the cell stack, a cooling layer between the monocells in series, sealing gaskets between the monocells, the cooling layer and the end plates, bolt holes reserved for assembly and corresponding bolts; the single cell comprises the bipolar plate of the fuel cell, a membrane electrode and a sealing ring, wherein the bipolar plate is made of the full-through-hole metal fiber sintered body in the first embodiment; the cooling layer is composed of a metal fiber felt, the thickness of the cooling layer is 0.1mm-5mm, and the metal fiber felt forming the cooling layer is a stainless steel fiber felt or a titanium alloy fiber felt or a copper alloy fiber felt; the arrangement of the metal fiber felts forming the cooling layer in the fuel cell stack is determined according to the cooling effect, a metal fiber felt is arranged at intervals of a certain number of single cells, cooling water forms turbulent flow in a three-dimensional net structure of the metal fiber felts, and the cooling efficiency is high.
The principle and the implementation mode of the invention are explained by applying specific examples, and the description of the above examples is only used for helping understanding the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In summary, this summary should not be construed to limit the present invention.
Claims (10)
1. A full-through-hole metal fiber sintered body fuel cell bipolar plate is characterized in that: the metal fiber sintered plate is characterized by comprising a conductive separation plate and flow field plates, wherein the flow field plates are arranged on one side or two sides of the conductive separation plate, the flow field plates are metal fiber sintered plates made of metal fiber sintered bodies, and the flow field plates are integrally connected with the conductive separation plate in a sintered mode or in a welded mode or in a glued joint mode.
2. The full via metal fiber sintered body fuel cell bipolar plate of claim 1, wherein: the conductive partition plate is of a flat structure, and the thickness of the conductive partition plate is 0.1-1 mm.
3. The full via metal fiber sintered body fuel cell bipolar plate of claim 2, wherein: the conductive separator plate is a metal plate or a graphite/polymer composite material plate.
4. The full via metal fiber sintered body fuel cell bipolar plate of claim 1, wherein: the flow field plate is of a flat plate structure, the thickness of the flow field plate is 0.2mm-3mm, the equivalent diameter of metal fibers of the flow field plate is 2 μm-200 μm, the length of the fibers is 1mm-50mm, and the porosity is 55-90%.
5. The full via metal fiber sintered body fuel cell bipolar plate of claim 1, wherein: the metal fiber forming the flow field plate is titanium fiber, stainless steel fiber, copper fiber or high-entropy alloy fiber.
6. The full via metal fiber sintered body fuel cell bipolar plate of claim 1, wherein: and a flow channel is also processed on the end surface of one side, connected with the conductive partition plate, of the flow field plate, and the flow channel is processed by adopting a rolling method, an overhead method, a laser sintering method or a grinding machine polishing method.
7. The full via metal fiber sintered body fuel cell bipolar plate of claim 1, wherein: and the flow field plate on the side of the oxidant gas separated by the conductive separation plate is subjected to hydrophobic treatment, and a hydrophobic conductive film is formed on the surface of the metal fiber of the flow field plate.
8. The full via metal fiber sintered body fuel cell bipolar plate of claim 1, wherein: and the conductive separation plate and the flow field plate form a corrosion-resistant conductive film through nitriding treatment, carburizing treatment or carbonitriding surface treatment.
9. A fuel cell stack comprises a series main body of a plurality of single cells, end plates at two sides of the stack, a cooling layer between the single cells in series connection, sealing gaskets among the single cells, the cooling layer and the end plates, bolt holes reserved for assembly and corresponding bolts; the method is characterized in that: the single cell is composed of the full-through-hole metal fiber sintered body fuel cell bipolar plate, a membrane electrode and a sealing ring according to any one of claims 1 to 8; the cooling layer is composed of a metal fiber felt, and the thickness of the cooling layer is 0.1mm-5 mm.
10. The fuel cell stack of claim 9, wherein: the metal fiber felt forming the cooling layer is stainless steel fiber felt or titanium alloy fiber felt or copper alloy fiber felt.
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| CN201911155557.1A CN112838232B (en) | 2019-11-22 | 2019-11-22 | Full-through-hole metal fiber sintered body fuel cell bipolar plate and fuel cell stack |
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| CN201911155557.1A CN112838232B (en) | 2019-11-22 | 2019-11-22 | Full-through-hole metal fiber sintered body fuel cell bipolar plate and fuel cell stack |
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| CN112838232B CN112838232B (en) | 2023-03-31 |
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Cited By (5)
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| CN114914454A (en) * | 2022-07-01 | 2022-08-16 | 北京理工大学重庆创新中心 | High-entropy alloy current collector and preparation method and application thereof |
| WO2023202932A1 (en) * | 2022-04-22 | 2023-10-26 | Mahle International Gmbh | Bipolar element, in particular bipolar plate, and production method |
| CN117587357A (en) * | 2024-01-19 | 2024-02-23 | 北京开元新能科技有限公司 | Metal bipolar plate for proton exchange membrane fuel cell and preparation method and application thereof |
| CN117594823A (en) * | 2024-01-19 | 2024-02-23 | 浙江聚合储能科技有限公司 | Spliced liquid flow frame plate assembly and preparation method thereof |
| WO2023208279A3 (en) * | 2022-04-27 | 2024-04-11 | Schaeffler Technologies AG & Co. KG | Electrochemical cell and method for producing a component of an electrochemical cell |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023202932A1 (en) * | 2022-04-22 | 2023-10-26 | Mahle International Gmbh | Bipolar element, in particular bipolar plate, and production method |
| WO2023208279A3 (en) * | 2022-04-27 | 2024-04-11 | Schaeffler Technologies AG & Co. KG | Electrochemical cell and method for producing a component of an electrochemical cell |
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| CN117587357A (en) * | 2024-01-19 | 2024-02-23 | 北京开元新能科技有限公司 | Metal bipolar plate for proton exchange membrane fuel cell and preparation method and application thereof |
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| CN117587357B (en) * | 2024-01-19 | 2024-04-09 | 北京开元新能科技有限公司 | Metal bipolar plate for proton exchange membrane fuel cell and preparation method and application thereof |
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| CN112838232B (en) | 2023-03-31 |
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