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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: 2021-06-18
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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  • Preparation method of metal bipolar plate of proton exchange membrane fuel cell
  • Preparation method of metal bipolar plate of proton exchange membrane fuel cell
  • 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 preparation method of a metal bipolar plate of a proton exchange membrane fuel cell. According to the invention, the metal bipolar plate is prepared by adopting a method of firstly coating, then welding and finally hydroforming, so that the uniform thickness of the coating can be ensured, and the consistency of corrosion resistance and contact resistance of each part of the bipolar plate is ensured; and when the two layers of metal plates are welded, one non-welding area is reserved on each of the two sides, during hydraulic forming, the non-welding areas serve as liquid injection holes to inject high-pressure liquid between the two layers of metal plates, under the action of hydraulic pressure, the upper layer of metal plate is attached to the cavity wall of an upper mold plate, and the lower layer of metal plate is attached to the cavity wall of a lower mold plate, so a cathode plate and an anode plate are formed at the same time. When the method is adopted for hydraulic forming, the coating cannot be damaged, the formed runner is high in precision, the product percent of pass is high, and simultaneous forming of the cathode plate and the anode plate is achieved 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 Applications(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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