Backward air inlet fuel cell stack

Abstract

The invention discloses a backward air inlet fuel cell stack. The fuel cell stack comprises flat plate-shaped membrane electrode assemblies and pole plate assemblies, wherein the pole plate assemblies comprise an oxygen flow field plate, a hydrogen flow field plate and a cooling flow field plate, and the oxygen flow field plate and the hydrogen flow field plate are the same in structures; and the fuel cell stack is formed by stacking the membrane electrode assemblies and the pole plate assemblies repeatedly. Two gas inlet and outlet closed areas and an active reaction closed area on the front faces of the oxygen flow field plate and the hydrogen flow field plate are all surrounded by closed bosses. Each membrane electrode assembly comprises an active reaction area positioned in the middle and a boundary area arranged on the periphery of the active reaction area; and four groups of backward air inlet and outlet through holes are formed in the boundary area. According to the backward air inlet fuel cell stack provided by the invention, a backward air inlet function is realized, the pile sealing reliability can be improved further, the possibility of triggering safety accidents after cell overheating combustion can also be reduced, and the backward air inlet fuel cell stack is higher in practicability.

Description

technical field [0001] The invention relates to a battery manufacturing and energy storage device, in particular to a fuel cell stack structure with the function of back air intake. Background technique [0002] A fuel cell is a device that directly converts the chemical energy of fuel and oxidant into electrical energy through electrode reactions. The biggest feature of this device is that it can work uninterruptedly for a long time because no combustion is involved in the reaction process. At the same time, it has the two advantages of high energy conversion efficiency of ordinary chemical power sources and long continuous working time of conventional generator sets. [0003] Proton exchange membrane fuel cell (Protonexchangemembranefuelcell, PEMFC) is a kind of fuel cell, its electrolyte is made of solid polymer membrane, so it is also called solid polymer electrolyte fuel cell (SPEFC) or solid polymer fuel cell (SPFC) , has the advantages of high power density, low oper...

AI Technical Summary

Problems solved by technology

Such a design directly connects the inlet branch pipe and the active reaction area, which has the following problems: (1) The inlet area is equipped with a drainage channel, which cannot well support the membrane electrode assembly and seals corresponding to this area, and the sealing has certain problems. (2) Once overheating and combustion occurs in the reaction area, the smoke or flame will directly enter the gas pipeline, which may cause a wider range of hazards

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