A multi-manifold air supply fuel cell system and method

Abstract

The invention relates to a multi-manifold air supply fuel cell system, comprising an air compressor for pressing ambient air into the system; A humidifier arranged behind the air compressor; Multi-manifold, wherein the intake main pipe of the multi-manifold is connected with the outlet of the humidifier, and each branch manifold is respectively provided with a throttle valve; A fuel cell comprising a plurality of cell stack modules, wherein cathode terminals of each cell stack module are respectively connected with each branch manifold of a plurality of manifolds; An electric energy conversiondevice having one end connected to a fuel cell and the other end connected to a load; A control device respectively connected with the load and each throttle valve; Hydrogen storage device, wherein the hydrogen supply pipe of the hydrogen storage device is connected with the anode terminal of each battery stack module. Compared with the prior art, the invention improves the inconsistency degree of each module, improves the overall performance of the fuel cell system, and prolongs the service life of the fuel cell system.

Description

technical field [0001] The invention relates to a fuel cell, in particular to a multi-manifold air supply fuel cell system and method. Background technique [0002] Fuel cells are currently a promising new type of power source. Generally, hydrogen is used as fuel, as the negative electrode, and oxygen in the air is used as the positive electrode. The active substances (fuel and oxidant) of the fuel cell are continuously input while reacting, so this type of cell is actually an energy conversion device. Fuel cells are also receiving more and more attention because of their advantages such as high conversion efficiency, large capacity, high specific energy, wide power range, and no need for charging. [0003] Since the traditional fuel cell system is composed of multiple single cells in the form of bipolar plates integrated into a large electric stack in series, although this form of multi-cell integrated large electric stack has a simple structure and is easy to produce, the...

AI Technical Summary

Problems solved by technology

As the power demand of the fuel cell continues to increase, the integrated electric stack is getting bigger and bigger, which means that more single cells need to be connected in series to the electric stack, thus exacerbating the inconsistency among the single cells in the electric stack degree, increasing the possibility of fluctuations, making the local current density too high, causing hot spots or even reverse polarity, leading to failure of the stack

[0004] The oxygen supply system of the fuel cell has a great influence on the consistency of the stack

The traditional fuel cell oxygen supply system uses single-ended air supply, the humidified air is directly introduced through the inlet of the stack end cover, and then through the internal manifold on each side of the stack, although each The single-chip battery is equipped with an internal air flow field, which can better ensure that the air in the single-chip is evenly distributed, but because the air is passed through the uniform end cover opening between the single-chips, it finally reaches each single-chip battery. Inconsistent paths and uneven air volume will eventually lead to inconsistencies in the oxygen supply between the monoliths, stack fluctuations, and local current densities that are too low or too high, thus affecting the life of the overall single stack

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