Machining method of fuel cell bipolar plate

A processing method and fuel cell technology, applied in the direction of fuel cells, circuits, electrical components, etc.

Active Publication Date: 2020-01-31
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on this, it is necessary to provide a fuel cell bipolar plate pro...

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  • Machining method of fuel cell bipolar plate
  • Machining method of fuel cell bipolar plate
  • Machining method of fuel cell bipolar plate

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Embodiment Construction

[0072] In order to make the above objectives, features and advantages of the present application more obvious and understandable, the specific implementation of the present application will be described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are explained in order to fully understand this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of this application. Therefore, this application is not limited by the specific implementation disclosed below.

[0073] The serial numbers assigned to the parts herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequence or technical meaning. The terms "connection" and "connection" in this application, unless otherwise specified, include direct and indire...

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Abstract

The invention relates to a machining method of a fuel cell bipolar plate. According to the machining method, flow channels are processed on a graphite bipolar plate blank by utilizing laser accordingto a target flow channel structure chart, so that a formed graphite bipolar plate is obtained. The spot diameter of the laser in the method of the invention is micron-sized. According to the machiningmethod, the laser is used for machining the flow channels, so that no mechanical stress is generated in laser machining; the spot diameter is small, and therefore the laser can machine the flow channels with narrower ridge width which are arranged more densely; and the ultra-dense flow channels are beneficial to the diffusion of reaction gas and the improvement of the performance of the bipolar plate. The machining method further involves surface cleaning treatment and surface hydrophobic treatment performed on the formed graphite bipolar plate, so that and water does not tend to accumulate in the flow channels which have been subjected to the surface hydrophobic treatment. The gas conveying capacity of the bipolar plate formed by the machining method is enhanced, and the performance of the bipolar plate is also improved.

Description

Technical field [0001] This application relates to the technical field of fuel cells, and in particular to a method for processing a fuel cell bipolar plate. Background technique [0002] The bipolar plate is the core component of the fuel cell, and the design of the bipolar plate is the core factor that determines the performance of the fuel cell. The surface of the bipolar plate is provided with structures such as a cathode runner, an anode runner, and a cooling runner. The flow channel structure undertakes the functions of reaction gas distribution, gas cooling, and drainage in the fuel cell. [0003] In the prior art, the bipolar plate runner grooves are usually processed by machine tool processing and compression molding. Reducing the width of the spine of the flow channel can increase the diffusion efficiency of the reactive gas to the area under the spine. Therefore, increasing the density of the flow channel arrangement can improve the performance of the fuel cell. Due t...

Claims

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Application Information

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IPC IPC(8): H01M8/0258H01M8/0213
CPCH01M8/0213H01M8/0258Y02E60/50
Inventor 胡尊严李建秋徐梁飞刘慧泽徐领欧阳明高
Owner TSINGHUA UNIV
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