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Graphite bipolar plate for fuel cell and manufacturing process therefor

A fuel cell and manufacturing process technology, used in fuel cells, manufacturing tools, sustainable manufacturing/processing, etc., can solve the problems of the need to improve the electrical conductivity and the high resistivity of the electrode plate, and improve the flexural strength and flexibility. Good performance, good electrical conductivity

Active Publication Date: 2021-06-18
青岛岩海碳材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the related technologies mentioned above, the inventor believes that when the graphite bipolar plate is molded once, it is easy to generate pores inside, so that the resistivity of the electrode plate is relatively high after electrification, and the conductivity needs to be improved.

Method used

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  • Graphite bipolar plate for fuel cell and manufacturing process therefor
  • Graphite bipolar plate for fuel cell and manufacturing process therefor
  • Graphite bipolar plate for fuel cell and manufacturing process therefor

Examples

Experimental program
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Effect test

preparation example 1-4

[0049] Preparation Example 1-4 The coke particles were selected from Anyang Yuding Metallurgy Co., Ltd., the dolomite was selected from Lingshou County Dongfeng Dolomite Co., Ltd., and the carbon nanotubes were selected from Beijing Deke Daojin Technology Co., Ltd., the model is CNT104.

preparation example 1

[0050] Preparation Example 1: Mix diabase ore, coke grains and dolomite at a mass ratio of 1:0.3:0.2, melt at 1450°C, and draw at a speed of 3m / min to make a fiber intermediate. During the process, the carbon nanotubes are atomized and sprayed onto the surface of the fiber intermediate at a pressure of 6 MPa. The thickness of the carbon nanotubes is 0.1um, dried at 120°C for 2 hours, and crushed to obtain diabase fiber powder. The chemical composition of the dolomite is shown in Table 1. The mass ratio of calcium oxide and magnesium oxide in dolomite is 2:1, the fixed carbon content in coke particles is 84%, the sulfur content is 0.8%, the volatile matter is 2%, and the ash content is 13.5%. %, the calorific value is 4602kcal / kg, the particle size of diabase and dolomite is 20mm, and the particle size of coke particles is 60mm.

[0051] Table 1 Chemical composition of diabase

[0052] wt SiO 2

preparation example 2

[0053] Preparation example 2: Mix diabase ore, coke particles and dolomite at a mass ratio of 1:0.4:0.3, melt at 1480°C, and draw at a speed of 3.3m / min to make a fiber intermediate. In the process, the carbon nanotubes are atomized and sprayed onto the surface of the fiber intermediate at a pressure of 8 MPa. The thickness of the carbon nanotubes is 0.2um, dried at 130°C for 1.5h, and crushed to obtain diabase fiber powder. The chemical composition of greenstone is shown in Table 1. The mass ratio of calcium oxide and magnesium oxide in dolomite is 2:1, the fixed carbon content in coke particles is 84%, the sulfur content is 0.8%, the volatile matter is 2%, and the ash content The calorific value is 13.5%, the calorific value is 4602kcal / kg, the particle size of diabase and dolomite is 50mm, and the particle size of coke particles is 90mm.

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Abstract

The invention relates to the field of fuel cells, and particularly discloses a graphite bipolar plate for a fuel cell and a manufacturing process therefor. The manufacturing process for the graphite bipolar plate for the fuel cell comprises the following steps: S1, pre-pressing: pre-pressing exhaust lines on one surface or two surfaces of a graphite plate to obtain a prepressed bipolar plate; and S2, mold pressing: according to the design requirement of a flow channel, mold-pressing a flow channel on one surface or two surfaces of the prepressed bipolar plate after prepressing to prepare the double-grain graphite bipolar plate. The graphite bipolar plate for the fuel cell has the advantages of high conductivity and good mechanical property.

Description

technical field [0001] The present application relates to the technical field of fuel cells, more specifically, it relates to a graphite bipolar plate used in fuel cells and its manufacturing process. Background technique [0002] A fuel cell is a power generation device that directly converts the chemical energy in the fuel and oxidant into electrical energy through the electrocatalytic reaction on the electrode. The fuel cell bipolar plate is one of the key components of the fuel cell, generally composed of a plate and a flow field , the flow field includes gas inlet, gas reaction zone and gas outlet. At present, the research and application of bipolar plates mainly focus on metal material plates, molded material plates and graphite material plates. Graphite material plates are currently the most commonly used bipolar plates for fuel cells in China. The board has good electrical conductivity, thermal conductivity, stability and corrosion resistance. [0003] Traditional g...

Claims

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Application Information

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IPC IPC(8): B30B9/28H01M8/0213H01M8/0258
CPCB30B9/28H01M8/0213H01M8/0258Y02P70/50Y02E60/50
Inventor 张勇
Owner 青岛岩海碳材料有限公司
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