Fuel cell stack for jointly applying intraplate counter-flow flow field and interpolate counter-flow flow field

Abstract

The invention relates to a fuel cell stack for jointly applying an intraplate counter-flow flow field and an interpolate counter-flow flow field, belonging to the technical field of fuel cells. In the cell stack, the two sides of any membrane electrode are respectively provided with an intraplate counter-flow air flow field and an interpolate counter-flow fuel flow field, and the two sides of any membrane electrode are provided with cooling agents which flow to two types of cooling agent flow fields which are just opposite. The air flow field and the fuel flow field cross two relevant surfaces of single-pole plates, and the two types of cooling agent flow fields are respectively embedded at the middle of the back surfaces of the two types of reaction agent flow fields. Two groups of runners of the intraplate counter-flow air flow field, two groups of runners of the counter-flow fuel flow field and two types of cooling agent flow fields of the intraplate counter flow are respectively communicated with two pairs of air inlets and outlets, two pairs of fuel inlets and outlets and two pairs of cooling agent inlets and outlets. The six pairs of inlets are respectively distributed in an opposite angle manner; and in two pairs of inlets and outlets of each type of fluid, the inlet of one pair of inlet and outlet is always adjacent to the outlet of the pair of inlet and outlet. The fuel cell stack has the advantages of simultaneously realizing uniform distribution of four variants such as temperature, concentration, current density and stress and the like.

Description

technical field [0001] The invention relates to a fuel cell stack which combines the countercurrent flow field inside the plate and the countercurrent flow field between the plates, and belongs to the technical field of fuel cells. Background technique [0002] As reported in the literature Int.J.Hydrogen Energy 34 (2009) 6749-6764, the proton exchange membrane fuel cell stack is a highly complex power generation device integrating mass transfer, electricity transfer and heat transfer. In view of the requirements of improving the performance of the battery stack, increasing the life of the battery stack, and improving the adaptability of the battery stack to harsh operating conditions, the species concentration should be as uniform as possible in all active areas of all monolithic cells in the entire battery stack. Four types of uniform distributions are current density uniform distribution, temperature uniform distribution and stress uniform distribution. To achieve the un...

AI Technical Summary

Problems solved by technology

There are three main reasons why the traditional reactant flow field cannot meet the requirements: one is that it cannot support the countercurrent flow of the reactant in the plate; the other is that it cannot support the countercurrent flow between the coolant plates; cooperate and support each other

For this reason, literature Electrochem.Commun.9 (2007) 497-503 and J.Power Sources 109 (2002) 469-476 have proposed a reactant flow field with a certain degree of countercurrent properties in the plate, but due to their insufficient counterflow Therefore, it still cannot effectively promote the realization of four uniform distributions, and the large parasitic power caused by the excessive length of the flow channel groove makes it unable to meet the requirements of expanding the battery scale

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