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Composite bipolar plate for fuel cell as well as preparation method and application of composite bipolar plate

A bipolar plate and reinforcing material technology, which is applied in fuel cells, chemical instruments and methods, circuits, etc., can solve the problems of mechanical strength and electrical conductivity being difficult to take into account at the same time, low mechanical strength, and decreased electrical conductivity of bipolar plates. The effect of reducing the difficulty of demolding, high mechanical strength, and reducing the interface contact resistance

Active Publication Date: 2019-03-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Excellent electrical conductivity requires a high content of conductive fillers, which in turn tends to result in lower mechanical strength
Conversely, good mechanical strength depends on a high content of resin binder, which will cause a significant drop in the conductivity of the bipolar plate
Therefore, this kind of composite bipolar plate has the difficulty of taking into account the mechanical strength and electrical conductivity at the same time.

Method used

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  • Composite bipolar plate for fuel cell as well as preparation method and application of composite bipolar plate
  • Composite bipolar plate for fuel cell as well as preparation method and application of composite bipolar plate
  • Composite bipolar plate for fuel cell as well as preparation method and application of composite bipolar plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Weigh 0.3kg polyvinylidene fluoride resin, 2.7kg flake graphite, 0.1kg carbon fiber and carry out ball milling, the ball milling time is 10min, prepare the surface layer of the composite board; weigh 0.5kg phenolic resin, 2.1kg flake graphite, 0.15kg The carbon fiber was ball milled for 15 minutes to prepare the middle layer of the composite board; 0.15 kg polyvinylidene fluoride resin, 0.2 kg phenolic resin, 1.8 kg flake graphite, and 0.2 kg carbon fiber were weighed for ball milling, and the ball milling time was 15 min to prepare the composite board transition layer 1; weigh 0.18 kg polyvinylidene fluoride resin, 0.18 kg phenolic resin, 1.8 kg flake graphite, and 0.2 kg carbon fiber for ball milling, and the ball milling time is 15 minutes to prepare the transition layer 2 of the composite plate;

[0033] (2) after the lower surface layer raw material that step (1) is made is evenly tiled, after cold pressing, then transition layer 1, transition layer 2, intermedi...

Embodiment 2

[0037] (1) Weigh 0.1kg polytetrafluoroethylene resin, 0.2kg polyvinylidene fluoride resin, 2.8kg flake graphite, and 0.1kg carbon fiber for ball milling. The ball milling time is 20min to prepare the surface layer of the composite board; weigh 0.5kg epoxy Resin resin, 2.0kg flake graphite, 0.15kg carbon fiber are ball milled, and the ball milling time is 15min to prepare the middle layer of the composite board; weigh 0.05kg polytetrafluoroethylene resin, 0.1kg polyvinylidene fluoride resin, 0.2kg epoxy resin, 1.8kg of flake graphite and 0.2kg of carbon fiber were ball milled for 15 minutes to prepare the transition layer 1 of the composite board; weighed 0.08kg of polytetrafluoroethylene resin, 0.1kg of polyvinylidene fluoride resin, 0.18kg of epoxy resin, and 1.8kg of Flake graphite and 0.1kg carbon fiber were ball milled for 20 minutes to prepare the transition layer 2 of the composite board; weighed 0.06kg polytetrafluoroethylene resin, 0.12kg polyvinylidene fluoride resin, ...

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Abstract

The invention provides a composite bipolar plate. The composite bipolar plate comprises an upper surface layer, a lower surface layer and one or more intermediate layers, wherein one or more transition layers exist between the upper surface layer or the lower surface layer and each intermediate layer. The lower surface layer, the transition layer, the intermediate layer, the transition layer and the upper surface layer are sequentially placed into a die with a flow field and is spread and cold pressed to prepare a preform. Then, the preform is hot-pressed and is finally subjected to processessuch as demolding and aftertreatment to prepare the composite bipolar plate. The composite bipolar plate provided by the invention effectively balances the conflict between conductivity and bending strength and has good bending strength, conductivity and gas permeability.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to a composite bipolar plate used for fuel cells and its preparation method and application. technical background [0002] The increasingly severe energy problems and the environment force people to constantly seek new, cleaner and more efficient energy sources. A fuel cell (Fuel Cell) is an energy conversion device that directly converts chemical energy into electrical energy. It has high energy conversion efficiency, high energy density, Environmental friendliness and many other advantages have attracted much attention from academia and industry. [0003] The bipolar plate is a key component of the fuel cell, which distributes the fuel and oxidant, realizes the electrical connection between the monolithic cells, removes waste heat from the active area, prevents gas and coolant leakage, and facilitates water management in the cell and other functions. The first widely used b...

Claims

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Application Information

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IPC IPC(8): B32B37/06B32B37/10H01M8/0228
CPCB32B37/06B32B37/10H01M8/0228Y02E60/50
Inventor 邵志刚吕波
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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