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Bipolar plate, its preparation method and application

A bipolar plate and anodic oxidation technology, applied in the direction of final product manufacturing, sustainable manufacturing/processing, electrochemical generators, etc., can solve the problem of inability to meet the strong corrosive and harsh working environment of PEMFCs, poor mechanical strength, poor corrosion resistance, etc. question

Active Publication Date: 2021-10-22
HUNAN JINTIAN ALUMINUM HI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional carbon-based bipolar plates exhibit excellent corrosion resistance and electrical conductivity, but their mechanical strength is poor, and they are easily damaged when used in automobiles or other equipment involving high-frequency mechanical vibrations
In contrast, metal-based bipolar plates have the advantages of high mechanical strength and stable performance, but their poor corrosion resistance cannot meet the highly corrosive and harsh working environment of PEMFCs.

Method used

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  • Bipolar plate, its preparation method and application
  • Bipolar plate, its preparation method and application
  • Bipolar plate, its preparation method and application

Examples

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preparation example Construction

[0042] The method for preparing the above-mentioned bipolar plate 100 includes the following steps S110-S160:

[0043] S110 , providing a metal base 10 .

[0044] In this embodiment, the metal base 10 is titanium, titanium alloy or stainless steel.

[0045] It can be understood that the metal base 10 may be any metal base used for metal-based bipolar plates, not limited to the ones listed above.

[0046] In order to reduce the weight of the bipolar plate, thereby reducing the weight of the cell stack, in this embodiment, the thickness of the metal base 10 is 0.1 mm˜2 mm.

[0047] S120 , forming a porous metal oxide film layer 20 on the surface of the metal substrate 10 .

[0048] In this embodiment, the method for forming the porous metal oxide film layer 20 on the surface of the metal base 10 is: anodizing the metal base 10 .

[0049] Specifically, the conditions of anodic oxidation are: the metal substrate 10 is used as the anode, the graphite electrode is used as the cat...

Embodiment 1

[0091] 1) After grinding and polishing the surface of the titanium metal substrate, it is anodized to form a porous metal oxide film layer, and its surface is as follows: figure 2 As shown, the conditions of anodic oxidation are: the titanium metal substrate is used as the anode, the graphite electrode is used as the cathode, the area ratio of the cathode and the anode is about 1:8, and the electrolyte is a mixed solution of sulfuric acid and hydrochloric acid with a pH value of about 1, wherein the sulfuric acid The concentration is 350g / L, the concentration of hydrochloric acid is 50g / L; the temperature is room temperature (25°C), and the polarization current density is 3.2A / cm 2 , the time is 40min.

[0092] 2) Configure the hydroxyapatite hydrothermal reaction solution (1g / LCa(CH 3 COO) 2 ·H 2 O; 0.5g / LNaH 2 PO 4 , NaOH to adjust the pH value to 12), the above-mentioned titanium metal substrate forming a porous metal oxide film is placed in the hydrothermal reaction ...

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Abstract

The present application relates to bipolar plates, their preparation methods and applications. The bipolar plate includes a metal substrate, a porous metal oxide film layer formed on the surface of the metal substrate, a hydroxyapatite layer closely combined with the porous metal oxide film layer, a fluorine-containing resin layer compounded with the hydroxyapatite layer, and a layer containing A carbon layer tightly bonded to a fluororesin layer. The above-mentioned bipolar plate not only has good mechanical strength and stability, but also has good corrosion resistance, and has good hydrophobicity and conductivity, and is suitable for fuel cells.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a bipolar plate, its preparation method and application. Background technique [0002] Proton exchange membrane fuel cell (PEMFCs) is a kind of fuel cell, and its structure mainly includes membrane electrode assembly, bipolar plate, current collector, end plate and so on. During the operation of PEMFCs, the role of the bipolar plate is to support the membrane electrode assembly, current collection, heat conduction, gas distribution, isolation of fuel and oxidant, so it is required to have high corrosion resistance, low interface resistivity, good Mechanical strength, hydrophobicity and good stability in the working environment of PEMFCs, etc. [0003] Traditional carbon-based bipolar plates exhibit excellent corrosion resistance and electrical conductivity, but their mechanical strength is poor, and they are easily damaged when used in automobiles or other equipment involving...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/0245H01M8/023H01M8/0234H01M8/0239H01M8/10
CPCH01M8/023H01M8/0234H01M8/0239H01M8/0245H01M8/10Y02E60/50Y02P70/50
Inventor 高平平蒋兆汝刘春轩梁啟文陈杰吴云张扬
Owner HUNAN JINTIAN ALUMINUM HI TECH CO LTD