Ultrathin graphite composite bipolar plate base material capable of being quickly cold-pressed and molded and preparation method thereof

A technology of cold forming and bipolar plates, which is applied in the direction of fuel cells, battery electrodes, electrochemical generators, etc., can solve the problems of short service life, failure to meet the requirements of large quantities, low strength, etc., and achieve excellent product performance, Efficient production efficiency and the effect of improving electrical conductivity

Active Publication Date: 2020-11-10
青岛杜科新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Hydrogen energy fuel cell bipolar plates are divided into metal bipolar plates and graphite bipolar plates. At present, the unit price of metal bipolar plates is high and the service life is short, so that they cannot be widely promoted; graphite bipolar plates are further divided into engraved graphite bipolar plates. , flexible molded expanded graphite bipolar plate and molded graphite composite plate. The engraved graphite bipolar plate takes too long to process, and the single-chip double-channel plate requires a CNC process

Method used

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  • Ultrathin graphite composite bipolar plate base material capable of being quickly cold-pressed and molded and preparation method thereof
  • Ultrathin graphite composite bipolar plate base material capable of being quickly cold-pressed and molded and preparation method thereof
  • Ultrathin graphite composite bipolar plate base material capable of being quickly cold-pressed and molded and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0022] Example 1

[0023] The present invention provides a thin graphite composite bipolar plate base material A rapid cold forming, the material composition and weight percentage:

[0024] 150 mesh to 200 mesh natural flake graphite powder 40%

[0025] 100 mesh to 150 mesh graphite worms 20%

[0026] 200 mesh to 300 mesh graphite worms 15%

[0027] 23% of a synthetic resin

[0028] Surfactant 2%

[0029] In this embodiment, the graphite material is added to the dry mixer according to the composition and mixed, and the like graphite material mixed surfactant further added after mixing, the mixer is started and dried in vacuo apparatus, evacuated with stirring to ensure mixing after the powder was dried powder was completely removed, the dried mixed powder of 300 mesh was added milled granulator, the material through a 300 mesh screen, the operation is repeated until all the powder through a 300 mesh sieve. The three-dimensional mesh good graphite powder mixer, then added with a f...

Example Embodiment

[0031] Example 2

[0032] The present invention provides a thin graphite composite bipolar plate materials A preparation yl rapid cold forming, the material composition and weight percentage:

[0033] 150 mesh to 200 mesh natural flake graphite powder 50%

[0034] 100 mesh to 150 mesh graphite worms 15%

[0035] 200 mesh to 300 mesh graphite worms 10%

[0036] 23% of a synthetic resin

[0037] Surfactant 2%.

[0038] In this embodiment, the graphite material is added to the dry mixer according to the composition and mixed, and the like graphite material mixed surfactant further added after mixing, the mixer is started and dried in vacuo apparatus, evacuated with stirring to ensure mixing after the powder was dried powder was completely removed, the dried mixed powder of 300 mesh was added milled granulator, the material through a 300 mesh screen, the operation is repeated until all the powder through a 300 mesh sieve. The three-dimensional mesh good graphite powder mixer, then ad...

Example Embodiment

[0040] Example 3

[0041] The present invention provides a thin graphite composite bipolar plate materials A preparation yl rapid cold forming, the material composition and weight percentage:

[0042] 150 mesh to 200 mesh natural flake graphite powder 60%

[0043] 100 mesh to 150 mesh graphite worms 10%

[0044] 200 mesh to 300 mesh graphite worms 10%

[0045] 19% of a synthetic resin

[0046] Surfactant 1%.

[0047] In this embodiment, the graphite material is added to the dry mixer according to the composition and mixed, and the like graphite material mixed surfactant further added after mixing, the mixer is started and dried in vacuo apparatus, evacuated with stirring to ensure mixing after the powder was dried powder was completely removed, the dried mixed powder of 300 mesh was added milled granulator, the material through a 300 mesh screen, the operation is repeated until all the powder through a 300 mesh sieve. The three-dimensional mesh good graphite powder mixer, then ad...

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Abstract

The invention provides an ultra-thin graphite composite bipolar plate base material capable of being quickly cold-pressed and molded. The base material comprises the following components and raw materials in percentage by weight: 40-60% of 150-200-mesh natural flake graphite powder, 5-20% of 100-150-mesh graphite worms, 5-15% of 200-300-mesh graphite worms, 15-35% of synthetic resin and 1-3% of asurfactant. The invention also discloses a preparation method of the base material. The bipolar plate base material can be directly subjected to cold press molding in a mold with a runner through a hydraulic machine, the molding time is less than or equal to 2 minutes, the molding pressure is 100-120MPa, the moldable thickness is greater than or equal to 0.6 mm, the thinnest part of a mold pressing composite plate is 0.2 mm, and the cold press molded composite plate has initial strength, and can be easily demolded without a mold release agent. The molded composite plates can enter an oven in batches to be cured, the conductivity of the cured composite plates is greater than or equal to 350 S/cm, the contact resistance is less than or equal to 6 milliohm.cm<2>, the flatness is smaller thanor equal to 10 microns, the bending strength is larger than or equal to 50 MPa, the air permeability is smaller than or equal to 2 * 10<-8>cm<3> (cm<2>*S) -1, and the working pressure is greater thanor equal to 1 bar, and the thickness of a bipolar plate which can be formed is less than or equal to 1.4mm.

Description

technical field [0001] The invention relates to the technical field of composite base material design of graphite composite bipolar plates for hydrogen energy fuel cells, in particular to an ultra-thin graphite composite bipolar plate base material capable of rapid cold pressing and a preparation method thereof. Background technique [0002] Hydrogen energy fuel cell bipolar plates are divided into metal bipolar plates and graphite bipolar plates. At present, the unit price of metal bipolar plates is high and the service life is short, so that they cannot be widely promoted; graphite bipolar plates are further divided into engraved graphite bipolar plates. , flexible molded expanded graphite bipolar plate and molded graphite composite plate. The engraved graphite bipolar plate takes too long to process, and the single-chip double-channel plate requires a CNC processing cycle of 1 hour. The unit price of the product is high and cannot meet large quantities. Flexible molded ex...

Claims

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Application Information

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IPC IPC(8): H01M8/0213H01M8/0221H01M4/86H01M4/88B29C67/24
CPCH01M8/0213H01M8/0221H01M4/8652H01M4/8803B29C67/24H01M2004/8694Y02E60/50
Inventor 郑健保莫华李锦青张琦
Owner 青岛杜科新材料有限公司
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