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A kind of metal bipolar plate and its preparation method and fuel cell

A metal bipolar plate, metal substrate technology, applied in the direction of fuel cells, fuel cell components, circuits, etc., can solve the problems of not being able to have excellent corrosion resistance and electrical conductivity, and achieve improved electrical conductivity, excellent corrosion resistance and Electrical conductivity, life-extending effect

Active Publication Date: 2020-12-18
浙江锋源氢能科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Due to the harsh operating environment of the metal bipolar plate, strict restrictions are placed on the conductivity and corrosion resistance of the coating. The currently selected coating materials cannot simultaneously have excellent corrosion resistance and conductivity

Method used

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  • A kind of metal bipolar plate and its preparation method and fuel cell
  • A kind of metal bipolar plate and its preparation method and fuel cell
  • A kind of metal bipolar plate and its preparation method and fuel cell

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preparation example Construction

[0048] On the other hand, the embodiment of the present invention also provides a method for preparing a metal bipolar plate, comprising the following steps:

[0049] 1. Pretreatment: Pretreatment is performed on the metal substrate to improve the cleanliness and surface roughness of the metal substrate. This step specifically includes:

[0050] 11) The first step of pretreatment: the metal substrate is degreased, polished, cleaned and dried in sequence. Specifically, the first degreasing treatment is performed on the selected metal substrate with 1M sodium hydroxide solution at high temperature (80° C.); after cleaning, the second degreasing cleaning is performed with alcohol. Then, it is polished with alumina or diamond polishing paste to reduce texture defects formed in the forming of the bipolar plate. Clean with pure water after the polishing treatment, put the cleaned metal substrate into pure water for storage, and blow it with clean nitrogen before use.

[0051] Thi...

Embodiment 1

[0061] The metal substrate of this embodiment is selected from 316L stainless steel. The steps of depositing a coating on the metal substrate to prepare a metal bipolar plate are as follows:

[0062] The first pretreatment: degreasing, polishing, cleaning and drying the metal substrate in sequence. Specifically, the first degreasing treatment is performed on the selected metal substrate with 1M sodium hydroxide solution at high temperature (80° C.); after cleaning, the second degreasing cleaning is performed with alcohol. Then, the substrate is polished with a brightener such as alumina polishing paste or diamond polishing paste. On the one hand, the oxide skin on the surface is removed, and on the other hand, the surface texture and defects are reduced by polishing treatment to improve the flatness of the material. Clean with pure water after polishing, and store the cleaned metal substrate in pure water, and blow it with clean nitrogen before use.

[0063] The second pretr...

Embodiment 2

[0068] The metal substrate of this embodiment is selected from 316L stainless steel. The steps of depositing a coating on the metal substrate to prepare a metal bipolar plate are as follows:

[0069] The first pretreatment: degreasing, polishing, cleaning and drying the metal substrate in sequence. Specifically, the first degreasing treatment is performed on the selected metal substrate with 1M sodium hydroxide solution at high temperature (80° C.); after cleaning, the second degreasing cleaning is performed with alcohol. Then, the substrate is polished with a brightener such as alumina polishing paste or diamond polishing paste. On the one hand, the oxide skin on the surface is removed, and on the other hand, the surface texture and defects are reduced by polishing treatment to improve the flatness of the material. Clean with pure water after polishing, and store the cleaned metal substrate in pure water, and blow it with clean nitrogen before use.

[0070] The second pretr...

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Abstract

The invention relates to a metal bipolar plate, a preparation method thereof and a fuel cell, which relate to the technical field of fuel cells. According to the main technical scheme, the metal bipolar plate comprises a metal substrate, a metal oxide coating and a conductive coating, wherein the metal oxide coating is deposited on the metal substrate, and the metal oxide coating comprises an unsaturated metal oxide layer; and the conductive coating is deposited on the metal oxide coating. Thus, the corrosion resistance, the conductivity and the coating binding force of the metal bipolar plateare improved, so that the service lives of the metal bipolar plate and the fuel cell are 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] In the fuel cell industry (such as PEM electrolysis hydrogen production and PEMFC fuel cell), the bipolar plate is one of the important components of the fuel cell. In the past, the main material of the bipolar plate was graphite, which was expensive, so that the cost of the bipolar plate material accounted for 25-35% of the cost of the entire battery; moreover, the graphite material also had the defect of poor machinability. Because metal materials have advantages such as low price, good machinability, good toughness, and good strength, the bipolar plates made of metal materials are considered by those skilled in the art to be an inevitable choice for fuel cells. The bipolar plate needs to have both excellent electrical conductivity and corrosion resistance; therefore, it is of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/0258H01M8/0228H01M8/0206H01M8/0204
CPCH01M8/0204H01M8/0206H01M8/0228H01M8/0258Y02E60/50
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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