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Metal bipolar plate and preparation method thereof and fuel cell

A metal bipolar plate and metal substrate technology, applied in fuel cells, battery electrodes, circuits, etc., can solve the problems of limited pore sealing ability inside the corrosion-resistant coating, achieve strong binding ability, improve corrosion resistance, and reduce contact The effect of resistance

Active Publication Date: 2019-04-02
浙江锋源氢能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although those skilled in the art have also proposed a repair scheme for pinhole defects, the existing repair schemes can only close the pores on the surface of the corrosion-resistant coating, and have limited ability to seal the internal pores of the corrosion-resistant coating.

Method used

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  • Metal bipolar plate and preparation method thereof and fuel cell
  • Metal bipolar plate and preparation method thereof and fuel cell
  • Metal bipolar plate and preparation method thereof and fuel cell

Examples

Experimental program
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Effect test

Embodiment 1

[0068] Such as Figure 1 to Figure 3 As shown, this embodiment provides a metal bipolar plate, wherein the metal bipolar plate includes: a metal substrate 1, a conductive coating 2 and a corrosion-resistant coating 3; wherein the conductive coating 2 is deposited on the metal substrate 1 . A corrosion-resistant coating 3 is deposited on the conductive coating 2 . Wherein, the material of the conductive coating 2 is conductive metal oxide.

[0069] The metal bipolar plate provided by the present embodiment deposits a layer of conductive coating 3 between the corrosion-resistant coating 3 and the metal substrate 1, and the conductive coating 3 is selected from metal oxide; The metal oxide is used as a primer to improve the bonding force between the coating and the metal substrate 1 (the inventor first discovered that the conductive metal oxide layer has a stronger bonding ability with the metal substrate, which is stronger than the bonding ability between the corrosion-resista...

Embodiment 2

[0074] Preferably, this embodiment provides a metal bipolar plate, compared with the previous embodiment, such as Figure 1 to Figure 3 As shown, the present embodiment further designs the corrosion-resistant coating as follows:

[0075] The composition of the corrosion-resistant coating 3 in this embodiment includes a first metal (preferably, the first metal includes one or more of titanium, chromium, tungsten, nickel, aluminum, copper); wherein, the corrosion-resistant coating The layer has a plurality of first pinholes distributed on the surface and inside of the corrosion-resistant coating, and the first pinholes are blocked by the oxide 31 formed by the first metal.

[0076] Here, due to the inherent defect of the physical vapor deposition method, it will cause pinholes in the deposition layer (for the repair of pinholes, the prior art also mentions self-repairing and oxidation sealing methods, but these sealing measures mainly It is aimed at the defects on the surface o...

Embodiment 3

[0080] Preferably, this embodiment provides a metal bipolar plate, compared with the above embodiments, such as figure 1 As shown, the metal bipolar plate in this embodiment also includes an amorphous carbon film 4 ; wherein the amorphous carbon film 4 is deposited on the corrosion-resistant coating 3 .

[0081] Preferably, the SP in the amorphous carbon film 4 2 The mass fraction of hybridized carbon is 60-90%; preferably, the SP in the amorphous carbon film 4 3 The mass fraction of hybridized carbon is 5-8%, and the balance is hydrogen.

[0082] Preferably, the thickness of the amorphous carbon film is 50 nm˜5 μm.

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Abstract

The invention discloses a metal bipolar plate and a preparation method thereof and a fuel cell, and relates to the technical field of the fuel cell. An adopted technical scheme is as follows: the metal bipolar plate comprises a metal substrate, a conducting coating, and an anti-corrosion coating; the conducting coating is deposited on the metal substrate; the anti-corrosion coating is deposited onthe conducting coating; and the material of the conducting coating is the conductive metal oxide. The metal dipolar plate further comprises an amorphous carbon film deposited on the anti-corrosion coating. The fuel cell comprises the above metal bipolar plate. The metal bipolar plate is mainly used for improving the binding force of the metal substrate and the coating in the metal bipolar plate,the coating is hard to fall off after being used for a long time, and the corrosion resistance of the metal bipolar plate is improved.

Description

technical field [0001] The invention relates to the technical field of fuel cell manufacturing, in particular to a metal bipolar plate, a preparation method thereof and a fuel cell. Background technique [0002] The problem of metal corrosion has always been a major problem faced by human beings. After metal parts are corroded, their mechanical properties (such as strength, plasticity, toughness) will be significantly reduced, their electrical properties and optical properties will also be deteriorated, and their geometric shapes will be destroyed; thereby accelerating the wear of metal parts and shortening The service life of the equipment can even cause catastrophic accidents such as fire and explosion. According to relevant statistics, the direct loss of steel due to corrosion accounts for about 1 / 4 of the annual output of steel. [0003] Specific to the fuel cell industry (eg, PEM electrolytic hydrogen production and PEMFC fuel cell), the bipolar plate is one of the im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M8/0228H01M4/88
CPCH01M4/8657H01M4/8817H01M8/0228H01M2004/8694Y02E60/50
Inventor 上官鹏鹏王海峰王利生
Owner 浙江锋源氢能科技有限公司
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