CN212676307U - Porous metal composite bipolar plate for fuel cell - Google Patents
Porous metal composite bipolar plate for fuel cell Download PDFInfo
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- CN212676307U CN212676307U CN202021644180.4U CN202021644180U CN212676307U CN 212676307 U CN212676307 U CN 212676307U CN 202021644180 U CN202021644180 U CN 202021644180U CN 212676307 U CN212676307 U CN 212676307U
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- bipolar plate
- metal substrate
- fuel cell
- porous metal
- composite bipolar
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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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The utility model discloses a porous metal composite bipolar plate for a fuel cell, which comprises a metal substrate, wherein the metal substrate is provided with a through hole; the surface of the metal substrate is provided with the conductive corrosion-resistant coating, and the conductive corrosion-resistant coating is filled in the through hole, so that the mutual connection of the coatings on the two sides of the bipolar plate is realized; the utility model discloses porous metal composite bipolar plate has kept metal bipolar plate intensity and rigidity good, the good, workable of electrically conductive heat conduction, can make in batches, thickness advantage such as thin, has strengthened the joint strength of electrically conductive corrosion resistant coating material simultaneously.
Description
Technical Field
The utility model relates to a fuel cell technical field, concretely relates to porous metal composite bipolar plate for fuel cell.
Background
A fuel cell is a chemical device that directly converts chemical energy into electrical energy, and is also called an electrochemical generator. The fuel cell uses fuel and oxygen as raw materials, and has no mechanical transmission component, so that it has no noise pollution and very little harmful gas. From the viewpoint of energy saving and ecological environment protection, fuel cells are the most promising power generation technology, and various countries strive to develop the related technologies.
The proton exchange membrane fuel cell belongs to the normal temperature fuel cell, and is the most important fuel cell. At present, related products are applied to related fields such as automobiles, but are in a overtaking state relatively in China. The proton exchange membrane fuel cell mainly comprises a proton exchange membrane, catalyst layers symmetrically arranged on two sides of the membrane, carbon paper, a sealing ring, a bipolar plate and the like. The proton exchange membrane, the catalyst layers on both sides of the proton exchange membrane and the carbon paper jointly form a membrane electrode assembly MEA.
Bipolar plates, also known as collector plates, are one of the important components of fuel cells. The following main functions and characteristics are required: the fuel and the oxidant are separated, the gas is prevented from permeating, the current is collected and conducted, the conductivity is high, the designed and processed flow channel can uniformly distribute the gas to a reaction layer of an electrode for electrode reaction, the heat can be discharged, the temperature field of the battery is kept uniform, the battery is corrosion-resistant, impact-resistant and vibration-resistant, the thickness is thin, the weight is light, the cost is low, the battery is easy to machine, and the battery is suitable for batch preparation and the like.
Bipolar plates typically include graphite bipolar plates, metal bipolar plates, and composite bipolar plates. The graphite bipolar plate is machined to form a gas flow channel, has stable chemical properties, has small contact resistance with an MEA (membrane electrode assembly), is difficult to machine, has large brittleness, is difficult to thin, is difficult to assemble, and is difficult to obtain a fuel cell with high power density. The metal bipolar plate is made of metal materials such as aluminum, nickel, titanium, stainless steel and the like, has good strength and rigidity, good electric and heat conduction, easy processing, batch manufacturing, thin thickness and easy obtaining of fuel cells with high power density, but is easy to corrode in the acidic environment of the fuel cells, needs surface coating protection, and requires small and stable contact resistance with MEA. The composite bipolar plate is usually prepared by taking graphite as a main material and adding a binder and the like, has certain flexibility, can solve the problems of difficult processing, frangibility and the like of the graphite bipolar plate, but has the disadvantages of complicated preparation method, poor electrical conductivity, poor mechanical property, difficult assembly and the like.
If the contact resistance between the bipolar plate and the MEA is large, a large amount of polarization loss occurs, and the operation efficiency is lowered. In the commonly used bipolar plate materials, the graphite material has the smallest contact resistance, and the surfaces of stainless steel and titanium both form non-conductive oxide films, so that the contact resistance is increased. Therefore, it is one of the hot spots in the research of fuel cells to utilize the advantages of the metal bipolar plate and overcome the disadvantages thereof. At present, foreign titanium and stainless steel metal bipolar plates are applied to fuel cell vehicles, and a plurality of institutes are researched and developed at home, but the problems of low coating stability, large contact resistance, poor durability and the like exist.
SUMMERY OF THE UTILITY MODEL
The utility model discloses problem to prior art existence provides a porous metal composite bipolar plate for fuel cell who has that intensity is good, electric conductivity, heat conductivity, corrosion resistance are good.
The utility model adopts the technical proposal that: a porous metal composite bipolar plate for a fuel cell comprises a metal substrate, wherein a through hole is formed in the metal substrate; the surface of the metal substrate is provided with a conductive corrosion-resistant coating; and the conductive corrosion-resistant coatings are filled in the through holes, and the conductive corrosion-resistant coatings on the upper surface and the lower surface of the metal substrate are interconnected through the through holes.
Further, the metal substrate is made of porous metal.
Furthermore, the through hole is in any shape with smooth transition of hole edges.
Further, the through holes are arranged in an array on the metal substrate.
Further, the through holes are randomly arranged on the metal substrate.
Furthermore, a transition layer is arranged between the metal substrate and the conductive corrosion-resistant coating, and the transition layer is tightly combined with the metal substrate and the conductive corrosion-resistant coating.
Further, the metal substrate is made of one of titanium, nickel, aluminum, titanium alloy, nickel alloy, aluminum alloy and stainless steel.
Furthermore, the conductive corrosion-resistant coating is compounded on the surface of the metal substrate and in the through hole by one of methods of slurry drawing, spraying, drawing and blade coating, and then is dried and rolled.
The utility model has the advantages that:
(1) the metal substrate of the utility model is made of porous metal material, and the surface is provided with the conductive corrosion-resistant coating, thus retaining the advantages of good strength, good electric and heat conductivity, good corrosion resistance, light weight, easy batch processing and low cost of the metal bipolar plate;
(2) the utility model forms a three-dimensional coherent protective layer on the coating material through the porous structure of the metal and the through holes arranged on the metal substrate, thereby enhancing the connection strength of the coating;
(3) the utility model discloses owing to adopt porous metal material preparation, can be so that form the transition layer between metal substrate and the coating.
Drawings
Fig. 1 is a schematic structural diagram of a metal substrate according to the present invention, wherein a is a front view, and b is a sectional view taken along a-a.
Fig. 2 is a schematic structural diagram of the porous metal composite bipolar plate of the present invention, wherein a is a front view, and B is a B-B sectional view of a.
In the figure: 1-metal substrate, 2-through hole, 3-conductive corrosion-resistant coating.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The following further description is made in conjunction with the accompanying drawings and specific embodiments.
As shown in fig. 1 and fig. 2, a porous metal composite bipolar plate for a fuel cell includes a metal substrate 1, wherein a through hole 2 is formed on the metal substrate 1; the surface of the metal substrate 1 is provided with a conductive corrosion-resistant coating 3; the through hole 2 is filled with conductive corrosion-resistant coatings, and the conductive corrosion-resistant coatings 3 on the upper surface and the lower surface of the metal substrate 1 are interconnected through the through hole 2.
The metal substrate 1 is made of porous metal. The through hole 2 is in any shape with smooth transition of hole edges. The through holes 2 are arranged in an array on the metal substrate 1. The through holes 2 are randomly arranged on the metal substrate 1. The arrangement form of the through holes is not limited, and the through holes can be arranged in any form.
The transition layer is arranged between the metal substrate 1 and the conductive corrosion-resistant coating 3, and is tightly combined with the metal substrate 1 and the conductive corrosion-resistant coating 3.
The metal substrate 1 is made of one of titanium, nickel, aluminum, titanium alloy, nickel alloy, aluminum alloy, and stainless steel. The metal substrate 1 made of the metal material can ensure the required mechanical property.
The conductive corrosion-resistant coating 3 is compounded on the surface of the metal substrate 1 and in the through hole 2 by one of the methods of slurry drawing, spraying, holding and blade coating, and then is dried and rolled. The adhesive in the coating is thermoplastic resin, when the bipolar plate flow channel is formed, the bipolar plate flow channel is heated to a proper temperature for deformation, and the coating material has certain rheological property, so that the coating material is compact and continuous. The flow channels on the bipolar plate can be designed into any existing structural form. The utility model discloses what change is that the material of metal substrate, the shape of metal substrate surface through-hole and the structure and the content such as preparation method of coating. Other structures may be the same as the existing fuel cell bipolar plates.
The porous metal composite bipolar plate has the advantages of good strength, electrical conductivity, thermal conductivity, good corrosion resistance, light weight, easy batch processing, low cost and the like; compared with the existing metal coating, the preparation method of the coating has good connection strength due to the special structure and is easy to process.
Claims (7)
1. A porous metal composite bipolar plate for a fuel cell is characterized by comprising a metal substrate (1), wherein a through hole (2) is arranged on the metal substrate (1); the surface of the metal substrate (1) is provided with a conductive corrosion-resistant coating (3); the through hole (2) is filled with conductive corrosion-resistant coatings, and the conductive corrosion-resistant coatings (3) on the upper surface and the lower surface of the metal substrate (1) are interconnected through the through hole (2).
2. The porous metal composite bipolar plate for a fuel cell as claimed in claim 1, wherein the metal substrate (1) is made of porous metal.
3. The porous metal composite bipolar plate for a fuel cell as claimed in claim 1, wherein the through-holes (2) have any shape with smooth hole edges.
4. The porous metal composite bipolar plate for a fuel cell as claimed in claim 1, wherein the through-holes (2) are arranged in an array on the metal substrate (1).
5. The porous metal composite bipolar plate for a fuel cell according to claim 1, wherein the through holes (2) are randomly arranged on the metal substrate (1).
6. The porous metal composite bipolar plate for the fuel cell according to claim 1, wherein a transition layer is further included between the metal substrate (1) and the conductive corrosion-resistant coating (3), and the transition layer is tightly bonded to both the metal substrate (1) and the conductive corrosion-resistant coating (3).
7. The porous metal composite bipolar plate for a fuel cell as claimed in claim 1, wherein the metal substrate (1) is made of one of titanium, nickel, aluminum, titanium alloy, nickel alloy, aluminum alloy, stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021644180.4U CN212676307U (en) | 2020-08-10 | 2020-08-10 | Porous metal composite bipolar plate for fuel cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021644180.4U CN212676307U (en) | 2020-08-10 | 2020-08-10 | Porous metal composite bipolar plate for fuel cell |
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| CN212676307U true CN212676307U (en) | 2021-03-09 |
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| CN202021644180.4U Active CN212676307U (en) | 2020-08-10 | 2020-08-10 | Porous metal composite bipolar plate for fuel cell |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113809347A (en) * | 2021-09-09 | 2021-12-17 | 上海交通大学 | Corrosion-resistant coating of fuel cell metal bipolar plate and preparation process thereof |
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2020
- 2020-08-10 CN CN202021644180.4U patent/CN212676307U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113809347A (en) * | 2021-09-09 | 2021-12-17 | 上海交通大学 | Corrosion-resistant coating of fuel cell metal bipolar plate and preparation process thereof |
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