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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 processing cycle of 1 hour. The unit price of the product is high and cannot meet large quantities. Flexible molded expanded graphite bipolar plates have high production efficiency, but low strength and low conductivity, which cannot meet the requirements of ultra-thin graphite bipolar plates. Molded graphite composite bipolar plates have high strength and can produce ultra-thin bipolar plates. board, but the existing process route is thermosetting molding, and the molding time is more than 20 minutes. Suitable for mass production promotion

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

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Effect test

Embodiment 1

[0023] The invention provides an ultra-thin graphite composite bipolar plate base material that can be quickly cold-pressed, and its components and raw material weight percentages are:

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

[0025] 100-150 mesh graphite worms 20%

[0026] 200-300 mesh graphite worms 15%

[0027] Synthetic resin 23%

[0028] Surfactant 2%

[0029] In this embodiment, the graphite material is added into the dry mixer according to the proportion for mixing, and after the graphite material is mixed evenly, the surfactant is added to further mix evenly, and the vacuum equipment of the dry mixer is started, and vacuum is drawn while stirring to ensure mixing After the powder is dried, take out all the powder, put the mixed and dried powder into a 300-mesh granulator for grinding, pass through a 300-mesh sieve, and repeat the operation until all the powder passes through the 300-mesh sieve. Add the sieved graphite powder into the three-di...

Embodiment 2

[0032] The invention provides an ultra-thin graphite composite bipolar plate base material and a preparation process that can be rapidly cold-pressed. The components and weight percentages of the raw materials are:

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

[0034] 100-150 mesh graphite worms 15%

[0035] 200-300 mesh graphite worms 10%

[0036] Synthetic resin 23%

[0037] Surfactant 2%.

[0038] In this embodiment, the graphite material is added into the dry mixer according to the proportion for mixing, and after the graphite material is mixed evenly, the surfactant is added to further mix evenly, and the vacuum equipment of the dry mixer is started, and vacuum is drawn while stirring to ensure mixing After the powder is dried, take out all the powder, put the mixed and dried powder into a 300-mesh granulator for grinding, pass through a 300-mesh sieve, and repeat the operation until all the powder passes through the 300-mesh sieve. Add the sieved gr...

Embodiment 3

[0041] The invention provides an ultra-thin graphite composite bipolar plate base material and a preparation process that can be rapidly cold-pressed. The components and weight percentages of the raw materials are:

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

[0043] 100-150 mesh graphite worms 10%

[0044] 200-300 mesh graphite worms 10%

[0045] Synthetic resin 19%

[0046] Surfactant 1%.

[0047] In this embodiment, the graphite material is added into the dry mixer according to the proportion for mixing, and after the graphite material is mixed evenly, the surfactant is added to further mix evenly, and the vacuum equipment of the dry mixer is started, and vacuum is drawn while stirring to ensure mixing After the powder is dried, take out all the powder, put the mixed and dried powder into a 300-mesh granulator for grinding, pass through a 300-mesh sieve, and repeat the operation until all the powder passes through the 300-mesh sieve. Add the sieved gr...

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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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