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A kind of preparation method of metal bipolar plate of proton exchange membrane fuel cell

A metal bipolar plate and proton exchange membrane technology, applied in fuel cell parts, fuel cells, circuits, etc., can solve the problems of flow channel structure damage, lower product qualification rate, low forming efficiency, etc., to achieve consistent pressure, Solve the effect of easy damage to the mold and uniform pressure transmission

Active Publication Date: 2022-04-01
UNIV OF JINAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can improve the accuracy of the flow channel structure to a certain extent, it can only realize the forming of a single-layer plate, and two single-layer plates need to be welded later, the forming efficiency is low, and the welding process is easy to cause damage to the flow channel structure , reduce the pass rate of the product

Method used

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  • A kind of preparation method of metal bipolar plate of proton exchange membrane fuel cell
  • A kind of preparation method of metal bipolar plate of proton exchange membrane fuel cell
  • A kind of preparation method of metal bipolar plate of proton exchange membrane fuel cell

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preparation example Construction

[0032] The invention provides a method for preparing a metal bipolar plate of a proton exchange membrane fuel cell, comprising the following steps:

[0033] (1) Depositing a corrosion-resistant coating on the surface of the metal sheet to obtain a corrosion-resistant metal sheet;

[0034] (2) Two corrosion-resistant metal sheets are superimposed and welded around, and an unwelded area is left on both sides during welding, and the unwelded area is used as a liquid injection hole during hydroforming;

[0035] (3) Place the double-layer metal plate obtained in step (2) in the mold of the hydraulic device, inject high-pressure liquid between the two-layer metal plates through the liquid injection hole, so that the upper and lower plates of the double-layer metal plate form flow channels at the same time structure to obtain a proton exchange membrane fuel cell metal bipolar plate; the proton exchange membrane fuel cell metal bipolar plate includes a cathode plate and an anode plate...

Embodiment 1

[0048] Select a 304 stainless steel sheet with a thickness of 0.1 mm to remove oxides and organic matter on the surface of the substrate. After drying, place it in a vacuum chamber, and then pump the air pressure of the chamber to 2×10 -3 Below Pa.

[0049] A layer of silicon-containing amorphous carbon film (a-C:Si) was prepared on the surface of 304 stainless steel sheet by plasma enhanced chemical vapor deposition (PECVD). 4 As the reaction source gas, SiH 4 The flow rate is 8mL / min, and a layer of silicon-containing amorphous carbon film (a-C:Si) is prepared on the surface of 304 stainless steel sheet; the stainless steel sheet deposited with silicon-containing amorphous carbon film is processed into multiple 550×220mm size sheet.

[0050] The two layers of processed stainless steel sheets are overlapped and placed on the welding fixture, and the sheets are clamped on both sides during the welding process. The YLR SM-200 fiber laser is selected to output single-mode las...

Embodiment 2

[0054] Select a 316L stainless steel sheet with a thickness of 0.1mm to remove oxides and organic matter on the surface of the substrate. After drying, place it in a vacuum chamber, and then pump the air pressure of the chamber to 2×10 -3 Below Pa.

[0055] A layer of silicon-containing amorphous carbon film (a-C:Si) was prepared on the surface of 316L stainless steel sheet by plasma enhanced chemical vapor deposition (PECVD). 4 As the reaction source gas, SiH 4 The flow rate is 8mL / min, and a layer of silicon-containing amorphous carbon film (a-C:Si) is prepared on the surface of 316L stainless steel sheet; the stainless steel sheet deposited with silicon-containing amorphous carbon film is processed into multiple 550×220mm size sheet.

[0056] The two layers of processed stainless steel sheets are overlapped and placed on the welding fixture, and the sheets are clamped on both sides during the welding process. The YLR SM-200 fiber laser is selected to output single-mode l...

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Abstract

The invention relates to the technical field of fuel cells, and provides a method for preparing a metal bipolar plate of a proton exchange membrane fuel cell. The invention adopts the method of first coating, then welding, and finally hydroforming to prepare the metal bipolar plate, which can ensure uniform coating thickness, and ensure the consistency of corrosion resistance and contact resistance in all parts of the bipolar plate; the invention welds two layers of metal Leave an unwelded area on each side of the plate. During hydroforming, the unwelded area is used as a liquid injection hole to inject high-pressure liquid between the two metal plates. Under the action of the hydraulic pressure, the upper metal plate and the upper template The cavity wall is attached, and the lower metal plate is attached to the cavity wall of the lower template, so that the cathode and anode double plates are formed at the same time. Adopting the method of the invention to carry out hydroforming does not cause damage to the coating, the formed flow channel has high precision, and the product qualification rate is high, and the invention realizes the simultaneous forming of the cathode and anode double plates for the first time.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a method for preparing a metal bipolar plate of a proton exchange membrane fuel cell. Background technique [0002] A fuel cell is a device that directly converts the chemical energy of fuel into electrical energy. It is not limited by the Carnot cycle effect, has high efficiency, only produces water, and has no noise pollution. From the perspective of saving energy and protecting the ecological environment, Fuel cells are the most promising power generation technology. [0003] Fuel cells are mainly composed of membrane electrodes and bipolar plates, where the main functions of bipolar plates include: (a) separating and distributing fuel gas at the anode and oxygen / air at the cathode; (b) collecting and transferring current from one cell The anode conducts to the cathode of the next cell; (c) removes reaction products and heat from the cell; (d) provides mechanical support f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/0228H01M8/0206H01M8/0258
CPCH01M8/0228H01M8/0206H01M8/0258Y02E60/50
Inventor 夏佃秀易斌刘志恒高林玉韩青王红岩李元宏殷子强王守仁王东跃韩正鹏裴英超
Owner UNIV OF JINAN
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