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Treatment method for metal mesh flow field of bipolar plate

A treatment method and bipolar plate technology, applied to battery electrodes, electrical components, circuits, etc., can solve problems that affect the effective improvement of battery performance, metal ion pollution, battery performance degradation, etc., and achieve oxidation/passivation treatment and coating process Mature, increase reaction gas concentration, low cost effect

Inactive Publication Date: 2014-03-12
SUNRISE POWER CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] The disadvantage of the bipolar plate in the prior art is: the reaction gas concentration on the membrane electrode corresponding to the bipolar plate flow field protrusion is very small, and this part of the battery area contributes little to the overall performance, which affects the effective improvement of battery performance
The prior art uses ion plating to plate a modified protective layer on the surface of the metal plate, but it is difficult to ensure that all parts of the metal mesh in the gas flow field can be coated with a modified protective layer for the coating prepared by ion plating.
In the fuel cell environment, the unprotected porous metal flow field will be corroded, and the generated metal ions will also contaminate the electrodes, resulting in a decrease in battery performance

Method used

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  • Treatment method for metal mesh flow field of bipolar plate

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Effect test

Embodiment 1

[0020] The metal mesh flow field of the bipolar plate is made of foamed nickel, and the pore size of the foamed nickel is 50 μm. Firstly, the corrosion resistance is improved by oxidation. Oxidation conditions: oxidation temperature is 500°C, oxidation time is 30 minutes, oxidation environment is 1.01×10 5 Pa oxygen. Then perform ion bombardment coating treatment to make the contact surfaces on both sides conductive and corrosion-resistant: bombard the surface for 20 minutes in a glow discharge plasma environment under 5Pa argon gas, and then coat in an arc discharge plasma environment under 10Pa argon gas for 30 minutes. Coating is carbon film.

Embodiment 2

[0022] The metal mesh flow field of the bipolar plate is made of titanium alloy mesh, and the aperture size of the titanium alloy mesh is 1mm.

[0023] Firstly, the corrosion resistance is improved through passivation. Conditions: the passivation solution is 30% nitric acid solution, the passivation temperature is 60 degrees Celsius, and the passivation time is 30 minutes.

[0024] Ion bombardment coating is then carried out to make the contact surfaces on both sides conductive and corrosion-resistant: bombard the surface for 10 minutes in a glow discharge plasma environment under 2Pa argon gas, and then coat the film in an arc discharge plasma environment under 5 Pa argon gas for 10 minutes. The coating is a carbon titanium film.

Embodiment 3

[0026] The metal mesh used to prepare the bipolar plate flow field is a stainless steel mesh with a pore size of 1 mm.

[0027] Firstly, passivation is used to improve corrosion resistance. Conditions: The composition of passivation solution is 10g / L sodium hydroxide, 15g / L sodium carbonate, 50g / L sodium phosphate, 5g / L sodium silicate and 1g / L potassium permanganate, The passivation temperature is 80° C., and the passivation time is 20 minutes. Then conduct ion bombardment coating to make the contact surfaces on both sides conductive and corrosion-resistant: bombard the surface for 10 minutes in a glow discharge plasma environment under 2Pa argon gas, and then coat for 10 minutes in an arc discharge plasma environment under 5Pa argon gas minute. The coating is carbon zirconium film.

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Abstract

A treatment method for the metal mesh flow field of a bipolar plate comprises the steps of corrosion-resistant treatment and conductive treatment and is characterized in that the corrosion-resistant treatment refers to the passivating treatment or the oxidation treatment performed on the metal mesh flow field of the bipolar plate; the conductive treatment refers to the ion bombardment plating treatment on contact surfaces of the two sides of the bipolar plate metal mesh flow field subjected to corrosion-resistant treatment, and a plated film used for the ion bombardment plating treatment is a conductive corrosion-resistant film. The treatment method has the benefits that the corrosion resistance and the conductivity of the treated metal mesh flow field are improved, and the performance and the specific power density of an electric pile can be greatly improved; the cost of the raw materials of the flow field is low, and the cost of the oxidation / passivating treatment and the plating operation is also very low; the oxidation / passivating treatment and plating technologies are mature and are suitable for massive production and quality guarantee.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, in particular to a bipolar plate of a proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cell bipolar plates are mainly divided into three categories: 1. Bipolar plates that mechanically engrave a flow field on a hard graphite plate; 2. Bipolar plates that punch out a flow field from a thin metal plate; 3. Carbon powder , resin, etc. are mixed and then molded to form a bipolar plate. In addition, there are expanded graphite impregnated with resin and then stamped into bipolar plates. [0003] The disadvantage of the bipolar plate in the prior art is: the reaction gas concentration on the membrane electrode corresponding to the bipolar plate flow field protrusion is very small, and this part of the battery area contributes little to the overall performance, which affects the effective improvement of battery performance . The reason for this shortc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88
CPCY02E60/50H01M4/8878
Inventor 付宇侯中军
Owner SUNRISE POWER CO LTD
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