Proton exchange film fuel cell

Abstract

The invention discloses a proton exchange film fuel battery, which comprises the following parts: front lid board, back lid board and basic unit group between the front and back lid boards, wherein the baffle is set among the basic unit group to divide the unit into multiple basic unit subgroups to connect wetting device; the electrode board is set between the basic unit subgroup and wetting device; the water inlet channel, water outlet channel, gas inlet channel and gas outlet channel are set on the baffle; or the water inlet, water outlet, gas inlet and gas outlet are set on the back lid board. The invention reduces the flow quantity and flow speed of gas in the gas inlet and outlet well channel due to reducing the basic unit quantity of each basic unit subgroup, which improves the safety of fuel battery.

Description

technical field [0001] The invention relates to a proton exchange membrane fuel cell, in particular to a proton exchange membrane fuel cell with a plurality of basic unit subgroups. Background technique [0002] A proton exchange membrane fuel cell consists of a membrane electrode assembly (Membrane Electrode Assembly; hereinafter referred to as: MEA) and gas deflectors attached to both sides of the MEA to form a basic unit. When a certain pressure of hydrogen and oxygen (or air) is added to the gas deflectors on both sides of the MEA, electricity will be generated due to electrochemical reactions. In specific applications, the added gas must be moist. On the one hand, the wet gas can improve the power generation efficiency of the proton exchange membrane fuel cell; on the other hand, the dry gas will also take away the moisture on the surface of the MEA, which is very It is easy to cause MEA to be damaged due to cracking due to drying. In hydrogen-oxygen fuel cells, dry o...

AI Technical Summary

Problems solved by technology

Experiments have proved that when the flow and velocity of oxygen in the fuel cell are large, and there is a sharp change in the flow velocity, the probability of spontaneous combustion will increase significantly, and spontaneous combustion is very easy to occur where the oxygen intake shaft channel leads to the inlet of the deflector ;

[0005] (2) As the number of basic units increases, the inhomogeneity of gas distribution caused by the individual differences of each basic unit increases significantly, and the probability of water blockage in the flow field and insufficient gas supply increases greatly, resulting in a decrease in the overall performance of the fuel cell. Stablize;

[0006] (3) When a basic unit in the fuel cell spontaneously ignites, the flame spread through the air intake shaft channel may cause damage to all basic units, resulting in the failure of the fuel cell as a whole

However, the weight and volume of a series battery pack are larger than that of a single fuel cell with the same number of basic units; the connection and management of gas, water, and circuits are also much more complicated than a single fuel cell, and there is a power loss

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