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Graphite-metal frame composite bipolar plate and preparation method thereof

A metal frame, bipolar plate technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of high cost and difficult surface modification of metal plates, and achieve enhanced bending strength, good electrical conductivity, and overall strength. Effect

Active Publication Date: 2018-05-22
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In view of the problems existing in the above-mentioned prior art, the object of the present invention is to provide a graphite-metal frame composite bipolar plate and a preparation method thereof. The present invention prepares the graphite-metal frame bonded composite bipolar plate of the present invention, which has strength High, excellent electrical conductivity, strong corrosion resistance, etc., solve the problem of difficult surface modification and high cost of large-area metal plates, suitable for industrialization, and have great application prospects

Method used

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  • Graphite-metal frame composite bipolar plate and preparation method thereof
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  • Graphite-metal frame composite bipolar plate and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0062] A preparation method of a graphite-metal frame composite bipolar plate:

[0063] 1) Preparation of graphite plate: Add additives such as 65wt% artificial graphite, 20wt% phenolic resin, 15wt% carbon nanotubes and carbon black into a high-speed mixer for mixing, and the stirring time is 20min. Then, the mixture is put into a twin-screw extruder for kneading and granulation, and graphite plates with fuel flow channels 8 and oxidant flow channels 12 are prepared by extrusion and calendering, and the thickness of the graphite plate is 0.8 mm, the fuel flow channel and the oxidant flow channel are both concave and convex structures, the depth of the flow channel is 0.3mm, and the width is 1mm.

[0064] 2) Preparation of the metal frame of the anode plate: a 0.1 mm thick stainless steel 316 plate is stamped and formed in the mold, and the metal frame 401 of the stamped anode plate is distributed with the first fuel inlet 101, the second fuel inlet 102, the first fuel inlet 10...

Embodiment 2

[0068] A preparation method of a graphite-metal frame composite bipolar plate:

[0069] 1) Add additives such as 70wt% expanded graphite, 15wt% polypropylene, 15wt% carbon nanotubes and copper powder into a high-speed agitator for mixing, and the stirring time is 30min. Then, by molding the mixture, a graphite plate with a fuel flow channel 8 and an oxidant flow channel 12 is prepared respectively. The thickness of the graphite plate is 1.0 mm, and the fuel flow channel and the oxidizer flow channel are both concave and convex structures. The runner depth is 0.4mm and the width is 1mm.

[0070] 2) Preparation of the metal frame of the anode plate: the same as in Example 1, except that the stainless steel 316 plate with a thickness of 0.1 mm is replaced with a titanium alloy TC4 plate with a thickness of 0.2 mm.

[0071] 3) Preparation of the metal frame of the cathode plate: the same as in Example 1, except that the stainless steel 316 plate with a thickness of 0.1 mm is repl...

Embodiment 3

[0074] 1. Preparation of graphite-metal frame composite bipolar plate

[0075] 1) Add additives such as 75wt% natural graphite, 20wt% polyethylene, 10wt% carbon fiber and carbon black into a high-speed mixer for mixing, and the mixing time is 30min. Then, by injection molding the mixture, a graphite plate with a fuel flow channel 8 and an oxidant flow channel 12 is prepared respectively. The runner depth is 0.3mm and the width is 1mm.

[0076] 2) Preparation of the metal frame of the anode plate: the same as in Example 1, except that the stainless steel 316 plate with a thickness of 0.1 mm is replaced with a stainless steel 304 plate with a thickness of 0.2 mm.

[0077] 3) Preparation of the metal frame of the cathode plate: the same as in Example 1, except that the stainless steel 316 plate with a thickness of 0.1 mm is replaced with a stainless steel 304 plate with a thickness of 0.2 mm.

[0078] Step 4) is the same as in Example 1.

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Abstract

The invention relates to a graphite-metal frame composite bipolar plate and a preparation method thereof. The bipolar plate comprises a negative electrode plate and a positive electrode plate; the negative electrode plate and the positive electrode plate are both formed by a metal frame and a graphite plate in a gluing manner separately, wherein the whole graphite plate is glued in the metal framethrough a gluing region on the metal frame; and the negative electrode plate and the positive electrode plate are connected in a sealing manner to form the graphite-metal frame glued composite bipolar plate. The preparation method comprises the steps of preparation of the graphite plate, preparation of the metal frame of the positive electrode plate and preparation of the metal frame of the negative electrode plate. The graphite-metal frame glued composite bipolar plate prepared in the invention has the characteristics of high intensity, excellent conductive performance, high corrosion resistance and the like; the main body of the graphite-metal frame composite bipolar plate is the graphite plate and each frame is a metal plate, so that coating treatment of the large-area metal plate is omitted, and the problem of performance inconsistency and the like caused by troublesome large-area coating process and uneven coating can be avoided, and extremely high application prospect is achieved.

Description

technical field [0001] The invention belongs to the technical field of proton exchange membrane fuel cells, and in particular relates to a graphite-metal frame composite bipolar plate and a preparation method thereof. Background technique [0002] The proton exchange membrane fuel cell is an electrochemical energy conversion device. Its energy conversion efficiency is not limited by the Carnot cycle. It can directly convert chemical energy into electrical energy efficiently and cleanly, and the product is pure water, which is truly zero-emission. , Zero pollution. Proton exchange membrane fuel cells have shown broad application prospects in civil and military fields such as transportation, portable power supplies, decentralized power stations, aerospace and underwater vehicles. [0003] The bipolar plate is the core component of the proton exchange membrane fuel cell (PEMFC), and it is the main part of the volume and weight of the PEMFC cell. Bipolar plates account for 60%...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/96H01M4/88
CPCH01M4/86H01M4/88H01M4/96Y02E60/50
Inventor 李晓锦柳臻白兆圆
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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