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Metal bipolar plate, preparation method of metal bipolar plate and fuel cell

A metal bipolar plate and metal substrate technology, applied in fuel cells, battery electrodes, circuits, etc., can solve the problems of coating peeling, internal corrosion, fuel cell performance degradation, etc., to improve the bonding force, improve corrosion resistance, Effect of improving corrosion resistance and electrical conductivity

Pending Publication Date: 2019-05-14
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

[0005] (1) The bonding force between the corrosion-resistant coating and the metal plate is poor (especially the iron-based stainless steel material), resulting in a relatively short life of the bipolar plate. After hundreds to thousands of hours, the coating tends to fall off and internal corrosion occurs
[0006] (2) The inherent defects of physical vapor deposition cause pinholes in the coating, and the corrosive medium enters the interior of the film through the pinholes to reach the metal substrate and corrode the substrate
The corroded iron ions, chromium, nickel and other ions will react on the membrane battery again, resulting in a significant decline in the performance of the fuel cell

Method used

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  • Metal bipolar plate, preparation method of metal bipolar plate and fuel cell
  • Metal bipolar plate, preparation method of metal bipolar plate and fuel cell
  • Metal bipolar plate, preparation method of metal bipolar plate and fuel cell

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Embodiment 1

[0042] This embodiment provides a metal bipolar plate, such as figure 1 and figure 2 As shown, the metal bipolar plate in this embodiment includes: a metal substrate 1 , a corrosion-resistant coating 2 and a conductive coating 3 . Wherein, the metal substrate 1 includes a first surface that has undergone nitriding treatment (here, the first surface of the metal substrate 1 has been subjected to nitriding treatment, and a nitrided layer 11 is formed on the first surface of the metal substrate 1 and its vicinity); The corrosion-resistant coating 2 is deposited on the first surface of the metal substrate 1 and the conductive coating 3 is deposited on the corrosion-resistant coating 1 .

[0043] In the metal bipolar plate provided in this embodiment, the first surface of the metal substrate is made of a nitriding treatment structure (preferably, a nitriding heat treatment structure), so that the corrosion resistance of the first surface of the metal substrate can be improved, E...

Embodiment 2

[0046] Preferably, this embodiment provides a metal bipolar plate, compared with the previous embodiment, such as figure 1 and figure 2 As shown, the main component of the corrosion-resistant coating 2 includes the first metal (ie, the first metal element). Here, the first metal includes one or more of titanium, chromium, tungsten, nickel, aluminum, and copper. The thickness of the corrosion-resistant coating 2 is 20nm-5um. The corrosion-resistant coating 2 has a plurality of first pinholes; wherein, the first pinholes are distributed on the surface and inside of the corrosion-resistant coating 2; the first pinholes are blocked by the oxide 21 formed by the first metal.

[0047] 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...

Embodiment 3

[0050] Preferably, this embodiment provides a metal bipolar plate, compared with the above embodiments, such as figure 1 and figure 2 As shown, the specific design of the conductive coating 2 in this embodiment is as follows: by mass percentage, the composition of the conductive coating 2 includes 60-90% of carbon and 10-40% of the second metal; preferably, by mass percentage , the composition of the conductive coating 2 includes 85-90% carbon and 10-15% second metal. Preferably, the second metal is titanium. Preferably, the conductive coating 2 has a plurality of second pinholes, and the second pinholes are blocked by the oxide formed by the second metal.

[0051] The metal bipolar plate that this embodiment provides, by making the composition of conductive coating include carbon and second metal (preferably titanium); Conductivity; and the addition of the second metal is to oxidize and seal holes, that is, in the presence of oxygen, a second metal oxide is formed to bloc...

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Abstract

The invention relates to a metal bipolar plate, a preparation method of the metal bipolar plate and a fuel cell, and relates to the technical field of fuel cells. According to the technical scheme, the metal bipolar plate comprises a metal substrate, a corrosion-resistant coating layer and a conductive coating layer, wherein the metal substrate comprises a first surface which is subjected to nitriding treatment; the corrosion-resistant coating layer is deposited on the first surface of the metal substrate; and the conductive coating layer is deposited on the corrosion-resistant coating layer.The preparation method of the metal bipolar plate comprises the steps of performing preprocessing on the metal substrate, performing high-temperature nitriding treatment, depositing the corrosion-resistant coating layer on the first surface, subjected to nitriding treatment, of the metal substrate, and depositing the conductive coating layer on the corrosion-resistant coating layer. The fuel cellcomprises the metal bipolar plate. According to the method, the corrosion resistance and the conductivity of the metal bipolar plate are mainly improved, the bonding force between the coating layer and the metal substrate is improved, and the service life of the metal bipolar plate and the fuel cell is prolonged.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a metal bipolar plate, a preparation method thereof and a fuel cell. Background technique [0002] For the PEM electrolytic hydrogen production and PEMFC fuel cell industries, the cost of bipolar plate materials accounts for 25-35% of the entire fuel cell cost. The main material of the bipolar plate is graphite plate, but graphite has disadvantages such as high price and poor machinability. Therefore, in the prior art, the graphite plate is replaced by a metal plate with large market usage, low price, good mechanical processing, toughness, and strength. However, an oxide layer with poor conductivity will be formed on the surface of the metal plate, and corrosion will easily occur in the working environment of the stack. Moreover, the metal ions produced by metal corrosion diffuse and enter the membrane electrode, which will reduce the conductivity of the proton exchange memb...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M8/0228H01M4/88
CPCY02E60/50
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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