Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Flexible graphite manufacturing process for hydrogen fuel cell bipolar plate

A flexible graphite and fuel cell technology, applied in fuel cells, circuits, electrical components, etc., can solve the problems affecting the process and graphite plate quality, low raw material utilization rate, and agglomeration of expandable graphite raw materials, so as to achieve good separation effect of gas and materials , High raw material utilization rate, high expansion rate effect

Active Publication Date: 2020-09-22
浙江国泰萧星密封材料股份有限公司
View PDF9 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The second purpose of the present invention is to overcome the problems of agglomeration and low utilization rate of raw materials in the prior art.
[0009] The third object of the present invention is to overcome the problem that there are a large amount of harmful elements such as sulfur elements, halogen elements and heavy metal ions in the prior art after the graphite raw material is expanded, which affects the follow-up process and the quality of the graphite plate

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Flexible graphite manufacturing process for hydrogen fuel cell bipolar plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: The flexible graphite bipolar plate manufacturing process that is used for hydrogen fuel cell, concrete steps are as follows:

[0039] Step (1): Select fine-grained scales with a particle size greater than 150 meshes as the raw material, add concentrated sulfuric acid and hydrogen peroxide in different weight ratios to it for several times, and fully stir and mix sequentially to carry out gradient intercalation reaction.

[0040] Step (2): The material obtained in step 1 is mechanically sieved into coarse particles and fine particles, and then the sieved material is air-classified by an air classifier, and the air-classified particle size is greater than 80 mesh and sent to crushing Machine for mechanical crushing, and then air classification again.

[0041] Step (3): Start the feeding fan to send the classified material with a particle size of less than 80 meshes to the puffing furnace for puffing. The puffing temperature is 1000°C. During the puffing pro...

Embodiment 2

[0047] Example 2, the rest of this example refers to Example 1, the difference is that the gradient intercalation reaction in step 1 specifically includes the following steps:

[0048] Step S1: Select 1 part of flake graphite with a particle size of +100 mesh, add 2 parts by weight of 98% concentrated sulfuric acid, mix and stir for 30 minutes, then add 0.1 part by weight of hydrogen peroxide with a concentration of 30%, and continue stirring for 60 minutes; wash with water To neutral, dehydrated, dried to less than 1% moisture;

[0049] Step S2: Take 1 part of the dry material obtained in Step S1, add 3 parts by weight of 98% concentrated sulfuric acid, mix and stir for 30 minutes, then add 0.15 parts by weight of 35% hydrogen peroxide, and continue stirring for 60 minutes; wash with water To neutral, dehydrated and dried until the water content is less than 1%, the test expansion rate is 150ml / g;

Embodiment 3

[0050] Embodiment 3: the remainder of this embodiment is with reference to embodiment 1, and its difference is that the gradient intercalation reaction in step 1 specifically comprises the following steps:

[0051] Step S1: Select 1 part of flake graphite with a particle size of +100 mesh, add 2 parts by weight of 98% concentrated sulfuric acid, mix and stir for 30 minutes, then add 0.1 part by weight of hydrogen peroxide with a concentration of 30%, and continue stirring for 60 minutes; wash with water To neutral, dehydrated, dried to less than 1% moisture;

[0052] Step S2: Take 1 part of the dry material obtained in Step S1, add 3 parts by weight of 98% concentrated sulfuric acid, mix and stir for 30 minutes, then add 0.15 parts by weight of 35% hydrogen peroxide, and continue stirring for 60 minutes; wash with water To neutral, dehydrated and dried until the water content is less than 1%, the test expansion rate is 150ml / g;

[0053] Step S3: Take 1 part of the dry materia...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Granularityaaaaaaaaaa
Granularityaaaaaaaaaa
Expansion rateaaaaaaaaaa
Login to View More

Abstract

The invention discloses a flexible graphite manufacturing process for a hydrogen fuel cell bipolar plate, which adopts a combined process of mechanical screening, airflow classification, mechanical crushing and airflow classification, and solves the problems of agglomeration of a graphite raw material after intercalation reaction and a low utilization rate of the raw material due to over-wide particle size distribution of the graphite raw material. Concentrated sulfuric acid is used as an intercalating agent, hydrogen peroxide is used as an oxidizing agent, and harm to the environment and product use can be reduced. A high-temperature grading gas-material separation device is used for carrying out gas-material separation on an expanded material, so that the influence on the subsequent process due to the fact that harmful elements such as sulfur elements are attached to the material is reduced. A special surface structure is pressed by adopting a rubber casting mold, so that a fine gasrunner is conveniently pressed and formed by a subsequent process. A numerical control high-precision saw blade and negative pressure chip removal are combined, the size is accurately controlled in the cutting process, negative pressure chip removal is conducted on cut graphite chips, and the problems of high requirements on the size precision, graphite worms and adhesion are solved.

Description

technical field [0001] The invention relates to the technical field of preparation of fuel cell bipolar plates, in particular to a manufacturing process for flexible graphite bipolar plates used in hydrogen fuel cells. Background technique [0002] In the context of energy conservation and environmental protection, clean and sustainable energy has become our key energy technology. Due to its high power generation efficiency, less environmental pollution and many other advantages, fuel cells are gradually used in aerospace, electric vehicles and other fields, and have broad application prospects. Hydrogen fuel cell is a kind of fuel cell. Since its raw material is hydrogen, the products are water and carbon dioxide, and there is no problem of environmental pollution, it has gradually attracted attention. One of the core components of a hydrogen fuel cell is the bipolar plate. The bipolar plate is composed of two electrode plates with a proton exchange membrane sandwiched be...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01B32/205H01M8/0213
CPCC01B32/205H01M8/0213Y02E60/50Y02A50/2351
Inventor 孙利杰
Owner 浙江国泰萧星密封材料股份有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com