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A cathode water management structure for passive alcohol fuel cells

A fuel cell, passive technology, used in fuel cells, fuel cell additives, battery electrodes, etc., can solve the problem of self-breathing channel blockage in the cathode flow field, and achieve the prevention of flooding, good insulation performance, and battery short-circuit prevention. Effect

Active Publication Date: 2016-02-24
INFORMATION SCI RES INST OF CETC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a cathode water management structure of a passive alcohol fuel cell, which solves the problem of blockage of the self-breathing channel of the cathode flow field caused by liquid flooding, improves the mass transfer of oxygen, and improves the performance of the battery

Method used

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  • A cathode water management structure for passive alcohol fuel cells
  • A cathode water management structure for passive alcohol fuel cells
  • A cathode water management structure for passive alcohol fuel cells

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specific Embodiment approach 1

[0024] Specific embodiment 1: In this embodiment, an aluminum alloy is used to make the cathode flow field plate 7, and its structure is as Figure 2-3 As shown, the cathode flow field plate 7 is provided with self-breathing through holes 10, on the back of the cathode flow field plate 7 and between two adjacent columns of self-breathing through holes 10, an upper channel 8 is provided. A lower channel 12 is provided on the lower side and the front side of the cathode flow field plate 7, and two adjacent upper channels 8 and the lower channel 12 are connected through a circular hole 11, so that the liquid water can flow along the upper channel 8 and The lower channel 12 flows from the inside to the outside, and is prepared by the micro-arc oxidation technology on the upper channel 8 and the lower channel 12 for collecting liquid water, and on the surface where the cathode flow field plate 7 and the cathode current collecting plate 6 are in contact A layer of super-hydrophilic f...

specific Embodiment approach 2

[0026] The second embodiment: The difference between this embodiment and the first embodiment is that the electrolyte used in the micro-arc oxidation treatment of the cathode flow field plate 7 is 10 g / mL sodium aluminate and 1 g / mL sodium hypophosphite. mixture.

specific Embodiment approach 3

[0027] Specific embodiment three: this embodiment is different from specific embodiments one and two in that the power supply used in the micro-arc oxidation treatment of the cathode flow field plate 7 is a DC power supply, and the processing voltage is 300-600V.

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Abstract

The invention discloses a cathode water management structure of a passive alcohol fuel cell. The cathode water management structure comprises a cathode current collecting plate and a cathode flow field plate, wherein a self-breathing through hole is arranged on the cathode flow field plate, and the cathode flow field plate The back of the cathode flow field plate is provided with an upper channel for collecting liquid water, and the front of the cathode flow field plate is provided with a lower channel for collecting liquid water. The upper channel and the lower channel are connected by circular holes, and the upper channel and the lower channel are A layer of oxide ceramic film is prepared on the channel and on the contact surface of the cathode flow field plate and the cathode current collector plate by micro-arc oxidation technology. The invention solves the problem of blockage of the self-breathing channel of the cathode flow field caused by liquid flooding, improves the mass transfer of oxygen, and improves the performance of the battery.

Description

technical field [0001] The invention belongs to the field of proton exchange membrane fuel cells and relates to a cathode water management structure of passive alcohol fuel cells. Background technique [0002] With the rapid development of portable electronic technology, there is an increasing demand for high energy density miniature power supplies. It is difficult for traditional batteries to achieve long-term growth in energy density. Due to its simple structure, considerable energy density, and instant recharging, direct alcohol fuel cells have become a micro power source with great advantages. To make it more competitive, DMFCs can be run in passive mode, ie without auxiliary drive, relying on diffusion and natural convection to provide fuel and oxygen. In passive mode, the structure of the battery is simpler, but the lower mass transfer makes the battery lower in performance compared to active batteries. In passive alcohol fuel cells, liquid water droplets formed ins...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/04H01M4/86H01M8/0258H01M8/04119H01M8/1011
CPCH01M8/0258H01M8/04156Y02E60/50
Inventor 刘晓为张雪林袁玮键张宇峰王志刚
Owner INFORMATION SCI RES INST OF CETC
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