Composite graphite bipolar plate and preparation method

A composite graphite and bipolar plate technology, which is applied in the direction of final product manufacturing, sustainable manufacturing/processing, fuel cells, etc., can solve the problems affecting the overall performance and yield of fuel cells, poor bonding between metal plates and graphite flow channels, graphite The plate bonding process is complex and other issues, to achieve the effect of improving graphite strength, improving toughness and strength, and reducing thickness

Inactive Publication Date: 2020-09-22
内蒙古中科四维热管理材料有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the characteristics of graphite itself, the currently used graphite bipolar plates are highly brittle and have a large amount of compression deformation. During the repeated installation of fuel cell stacks, they are prone to damage such as fragmentation, which seriously affects the overall performance and yield of fuel cells.
Simply adopting the method of pasting graphite flow channels on the metal plate, the bonding force between the metal plate and the graphite flow channel is poor, and the bonding process after the graphite plate is formed is complicated

Method used

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  • Composite graphite bipolar plate and preparation method
  • Composite graphite bipolar plate and preparation method

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Embodiment 1

[0029] This embodiment provides a composite graphite bipolar plate, such as figure 1 shown, including:

[0030] expanded metal sheet 1, such as figure 2 As shown, there are a plurality of through holes 3; optionally, the thickness of the porous metal plate 1 is 0.1-0.4mm, for example, 0.1mm, 0.2mm, 0.3mm or 0.4mm can be selected; optionally, the The diameter of the through hole 3 is 10-100um, for example, 10um, 50um or 100um can be selected; optionally, the porous metal plate 1 is a titanium plate, a nickel plate or a stainless steel plate;

[0031] Runner ridges 2 are arranged on opposite surfaces of the porous metal plate 1;

[0032] a fixing column, arranged in the through hole 3 corresponding to the runner ridge 2, and the fixing column and the runner ridge 2 are integrally molded;

[0033] Optionally, the materials of the flow channel ridge 2 and the fixing column include: 5-10 parts of flake graphite with a diameter of 20-50 mm, 1-5 parts of graphene, 60-65 parts of ...

Embodiment 2

[0039] This embodiment provides a method for preparing a composite graphite bipolar plate, including:

[0040] Mix 5-10 parts of flake graphite with a diameter of 20-50 mm, 1-5 parts of graphene, 60-65 parts of graphite powder, 12-18 parts of phenolic resin and 1-5 parts of thermally conductive carbon fiber to form a mixture; optionally, use The high mixer stirs for 1-3h under the condition of 1500-3000r / min.

[0041] The mixture was molded on a perforated metal sheet to form the runner ridges and anchor posts.

[0042] The preparation method of the composite graphite bipolar plate in this embodiment provides a method for rapid prototyping and effective improvement of the bonding force. Effective bonding is achieved by embedding graphite powder into the porous plate, and the toughness and strength of the graphite plate are improved through the metal skeleton, effectively improving the bipolar plate. The comprehensive performance of the polar plate is conducive to reducing the...

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Abstract

The present invention provides a composite graphite bipolar plate. The composite graphite bipolar plate a porous metal plate having a plurality of through holes, runner ridges which are arranged on two opposite surfaces of the porous metal plate, and fixing columns which are arranged in the through holes corresponding to the runner ridges, wherein the fixing columns and the runner ridges are integrally formed in a compression molding mode. The composite graphite bipolar plate is advantaged in that effective combination is achieved by embedding graphite powder into the porous plate, toughness and strength of the graphite plate are improved through the metal framework, comprehensive performance of the bipolar plate is effectively improved, reduction of the thickness of the bipolar plate is facilitated, meanwhile, the forming process is simple, and batch production is facilitated.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a composite graphite bipolar plate and a preparation method thereof. Background technique [0002] Due to the characteristics of graphite itself, the currently used graphite bipolar plate is highly brittle and has a large amount of compression deformation. During the repeated installation of the fuel cell stack, it is very prone to damage such as fragmentation, which seriously affects the overall performance and yield of the fuel cell. Simply adopting the method of sticking the graphite flow channel on the metal plate, the bonding force between the metal plate and the graphite flow channel is poor, and the bonding process after the graphite plate is formed is complicated. Contents of the invention [0003] The composite graphite bipolar plate and the preparation method provided by the invention can improve the binding force between the metal plate and the flow channel. [0...

Claims

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Application Information

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IPC IPC(8): H01M8/0232H01M8/0234H01M8/0241H01M8/0258
CPCH01M8/0232H01M8/0234H01M8/0241H01M8/0258Y02E60/50Y02P70/50
Inventor 张亚村
Owner 内蒙古中科四维热管理材料有限公司
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