Direct methanol fuel cell supply system and direct methanol fuel cell supply method

Abstract

The invention discloses a direct methanol fuel cell supply system and a direct methanol fuel cell supply method. The direct methanol fuel cell supply system comprises a direct methanol fuel cell, an ultrasonic atomizer, a micro-fluidic chip, a fuel storage tank, a pure methanol storage tank, a water storage tank, micropumps and supply pipelines; the micro-fluidic chip comprises a flow field channel; the flow field channel is formed in a manner that a square circulating cavity, an arc channel and an expanding cavity are asymmetrically connected in sequence; the pure methanol storage tank and the water storage tank are respectively connected with two inlets of the micro-fluidic chip through the supply pipelines, and the flow of the pure methanol storage tank and the flow of the water storage tank are controlled by the corresponding micropumps; the outlet of the micro-fluidic chip is connected with the fuel storage tank; the outlet of the fuel storage tank is connected with the ultrasonic atomizer through the corresponding micropump; the ultrasonic atomizer is communicated with an anode flow field plate of the methanol fuel cell. The direct methanol fuel cell supply system and the direct methanol fuel cell supply method disclosed by the invention have the advantages that a methanol solution mixed by using the method is controllable in concentration; the methanol solution is mixed evenly, so that a good condition is provided for an atomization supply way, and the performance of the fuel cell is further improved; the discharge stability of the cell is improved by the even methanol solution.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to a direct methanol fuel cell supply system and method. Background technique [0002] Fuel cells have the advantages of high efficiency, low noise, no pollution, and high reliability, so they have received widespread attention. Among them, the proton exchange membrane fuel cell has always been a research hotspot because it can be quickly started at room temperature and the output power can be changed according to the load requirement. Direct methanol fuel cell is a kind of proton exchange membrane fuel cell, which is expected to be used in various portable electronic devices due to its advantages of high energy density and wide fuel source. However, because the methanol at the anode will reach the cathode of the battery through the proton exchange membrane (methanol permeation), electrochemical oxidation occurs at the cathode, and a short circuit is formed with the electroche...

AI Technical Summary

Problems solved by technology

Since the atomization supply method is greatly affected by the concentration of the solution, the traditional fuel preparation method is prone to problems such as inaccurate concentration control and uneven mixing due to many operations and equipment errors.

Inaccurate concentration control on the one hand makes the performance of the battery unable to be fully utilized, on the other hand causes a large error between the output performance of the battery and the expected output

Uneven fuel mixing will also bring a series of problems: when the concentration is high, methanol permeation will increase, which will reduce the open circuit voltage of the battery; when the concentration is low, the problem of methanol permeation will be alleviated, which will lead to unstable dynamic performance of the battery

The traditional fuel preparation method limits the further improvement of the performance of direct methanol fuel cells; the use of manual fuel preparation increases the labor intensity, increases the overall cost, and makes the operation of the battery more complicated

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