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Fuel cell bipolar plate production method

A fuel cell and production method technology, applied in the direction of fuel cells, electrochemical generators, circuits, etc., can solve the problems of high production cost, poor molding precision, and large number of molds, achieve sufficient plastic deformation, reduce welding difficulty, and pressure Delivers an even effect

Active Publication Date: 2022-02-15
DONGFENG MOTOR GRP
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Problems solved by technology

[0005] Conventional press stamping method has the advantages of high processing efficiency, but it needs a large number of molds (a total of two sets of molds are required, and the cathode plate and the anode plate each need a set of forming molds), and the forming precision is insufficient. At the same time, through The processing steps of metal bipolar plates by stamping, welding and coating are cumbersome and the production efficiency is low
[0006] In summary, the bipolar plate production method in the prior art has the technical problems of high production cost, long preparation cycle, and low forming precision of the bipolar plate

Method used

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Embodiment Construction

[0042] In order to enable those skilled in the technical field to which the application belongs to understand the application more clearly, the technical solutions of the application will be described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0043] The traditional bipolar plate manufacturing process is: stamping → laser welding → coating → sealing. Usually, the raw materials are stamped and formed into cathode plates and anode plates with fine flow channels, and the two unipolar plates are welded together by laser to form a bipolar plate structure of "two plates and three fields", and then the bipolar plates are coated. Layer treatment to improve its corrosion resistance, and then fill the sealing material in the designed sealing line on the bipolar plate. The forming accuracy of the bipolar plate is affected by factors such as plate springback, the forming accuracy is poor, and the entire production cycle is long.

[0044]...

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Abstract

The invention discloses a fuel cell bipolar plate production method, and solves the technical problems of high cost, long period and low bipolar plate forming precision of the existing production method. According to the fuel cell bipolar plate production method, firstly, holes are formed in substrates, and the holes serve as liquid injection holes in a subsequent hydraulic bulging step; the two substrates are welded into a whole according to a set welding track, the welding track completely coincides with a welding line in a bipolar plate, the two substrates are divided into a set number of closed areas by the welding line, and therefore a two-plate three-field structure is formed; and each closed area comprises at least one hole, so that the subsequent hydraulic bulging step can be conveniently carried out. By injecting liquid between the two substrates through the holes, and carrying out hydraulic forming, a flow channel on the bipolar plate and a structure at a fluid inlet and a fluid outlet. are formed. By removing redundant parts of the substrates after hydraulic forming, each fluid inlet / outlet is formed . The integrated forming method is adopted, the production cost is low, the production efficiency is high, and the bipolar plate forming precision is high.

Description

technical field [0001] The application belongs to the technical field of bipolar plate production methods, and in particular relates to a fuel cell bipolar plate production method. Background technique [0002] Proton exchange membrane fuel cell (PEMFC, also known as hydrogen fuel cell) is a power generation device that uses hydrogen as fuel to directly convert chemical energy into electrical energy. The bipolar plate is an important core component of the fuel cell, which plays the role of gas distribution, water heat management, current collection, and support for the stack. The bipolar plate includes a cathode plate and an anode plate. The two sides of the cathode plate are respectively the water field and the air field. field, the two sides of the anode plate are water field and hydrogen field respectively. Hundreds of bipolar plates and membrane electrodes are stacked, and the fastening force is applied through the end plates on both sides to form a fuel cell stack. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0297H01M8/22
CPCH01M8/0297H01M8/22Y02E60/50Y02P70/50
Inventor 王手龙王慧欧兵兵
Owner DONGFENG MOTOR GRP
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