Layered graphite composite bipolar plate and preparation method thereof

A layered, bipolar plate technology, applied in the direction of final product manufacturing, sustainable manufacturing/processing, fuel cells, etc., can solve the problem of reducing the forming thickness of graphite composite bipolar plate and precision forming flow channel, reducing the Problems such as graphite composite bipolar plate molding thickness and precision molding flow channel can alleviate low molding reliability, facilitate mass production, and improve bending strength and air tightness

Pending Publication Date: 2020-11-03
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] None of the existing technologies can effectively solve the problems of reducing the forming thickness of graphite composite bipolar plates and precision forming flow channels
The purpose of the present invention is to provide a layered graphite composite bipolar plate and its preparation method in order to solve the problems of reducing the forming thickness of the graphite composite bipolar plate and precisely forming the flow channel.

Method used

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  • Layered graphite composite bipolar plate and preparation method thereof
  • Layered graphite composite bipolar plate and preparation method thereof
  • Layered graphite composite bipolar plate and preparation method thereof

Examples

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preparation example Construction

[0068] A method for preparing a layered graphite composite bipolar plate, comprising the following steps:

[0069] S1: Preparation of thermoplastic resin / graphite composite sheet by roll forming;

[0070] S2: preparing a masterbatch of thermosetting resin / graphite composite material;

[0071] S3: Fill the drying mold with the masterbatch of thermosetting resin / graphite composite material, thermoplastic resin / graphite composite material plate and masterbatch of thermosetting resin / graphite composite material in sequence, and perform drying treatment;

[0072] S4: put the dried material in step S3 together with the drying mold into a hot molding mold, pressurize and heat to shape, and obtain a layered graphite composite bipolar plate after cooling.

[0073] Preferably step S1 comprises the following process:

[0074] S11: Dry blend thermoplastic resin and graphite powder, mix evenly and then dry to prepare masterbatch A:

[0075] S12: Preheat masterbatch A in a preheating box...

Embodiment 1

[0093] Prepare a layered graphite composite bipolar plate, comprising the following steps:

[0094] (1) Dry-mix fluorinated ethylene-propylene (FEP) with an average particle size of 8 μm and flake graphite with an average particle size of 50 μm through a plastic kneader for 2 hours, and the mass ratio of FEP to flake graphite is 4:6. Then the mixed masterbatch was put into a vacuum drying oven, and dried at 70° C. for 2 hours to obtain masterbatch A.

[0095] (2) The masterbatch A is dropped into the preheating box 203 by the vibrating feeder 201, such as image 3 As shown, the preheating temperature is 360°C.

[0096] (3) The transfer mechanism 208 transfers the masterbatch A to the rough roll, and rough rolls it into a plate with a thickness of 2.0 mm. The last 7 rounds of finish rolling process the thickness to 1.5mm, 1.0mm, 0.7mm, 0.5mm, 0.4mm, 0.35mm, 0.3mm in sequence. The rough roll and finish roll are heated during operation to keep the surface temperature of the ro...

Embodiment 2

[0103] Prepare a layered graphite composite bipolar plate, comprising the following steps:

[0104] (1) Based on Example 1, complete the production of the middle layer.

[0105] (2) Preheat liquid epoxy resin (E-44) and curing agent phthalic anhydride (HHPA) to 110°C respectively, and keep for 2 minutes.

[0106] (3) Weighing and taking epoxy resin and HHPA mass ratio is 5:4, and at the same temperature, pour into a beaker and stir for 5min, take 0.5% benzylmethyldimethylamine of epoxy resin quality in the stirring process as Accelerators are added to epoxy resins.

[0107] (4) Add graphite flakes to the homogeneously mixed resin, with a particle size of 60 μm to 80 μm. The mass ratio of resin to graphite mixed is 2:8. Maintain a constant temperature of 110°C, and mechanically stir for 20 minutes until uniformly mixed to obtain masterbatch B.

[0108] (5) Add masterbatch B, intermediate layer 101, and masterbatch B to the drying mold in sequence. The filling thickness of m...

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Abstract

The invention relates to a layered graphite composite bipolar plate and a preparation method thereof. The layered graphite composite bipolar plate comprises a middle layer and surface layers arrangedat the two sides of the middle layer, the middle layer is a thermoplastic resin/graphite composite material plate, the surface layers are thermosetting resin/graphite composite material layers, and the outer surfaces of the surface layers are provided with flow channel structures. Compared with the prior art, the middle layer is made of the thermoplastic composite material, the feeding precision of the thermosetting composite material is improved in an auxiliary mode in the manufacturing process, and meanwhile the problem that the forming reliability of the thermosetting composite material islow under the high carbon content is solved; in addition, the middle layer with high resin content in the layered polar plate improves the bending strength and air tightness of the bipolar plate, andthe surface layer with high carbon content improves the conductivity of the bipolar plate; the overall performance of the bipolar plate is improved by means of respective optimization of different functional layers, and meanwhile, the preparation process is simple and convenient, is beneficial to batch production, and has a higher practical value.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and relates to a proton exchange membrane fuel cell, in particular to a layered graphite composite bipolar plate and a preparation method thereof. Background technique [0002] Due to its clean and efficient energy conversion mechanism, fuel cell technology has broad application prospects. Especially the proton exchange membrane fuel cell (Proton exchange membrane fuel cell, PEMFC) has a fast starting speed and a low working temperature, and is the most suitable type of fuel cell for large-scale application. The bipolar plate is one of the key components of the fuel cell, and it plays multiple functions in the fuel cell, such as isolation and distribution of the anode and cathode reactants, current collection, heat conduction, sealing, and supporting membrane electrodes. Therefore, the volume and performance of the bipolar plate has a direct impact on the performance of the fuel cell. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0228H01M8/0221H01M8/0213H01M8/0258
CPCH01M8/0213H01M8/0221H01M8/0228H01M8/0258Y02E60/50Y02P70/50
Inventor 明平文郑俊生张存满彭宇航樊润林
Owner TONGJI UNIV
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