Fuel cell based on inter-plate counter current coolant flow field

Abstract

The present invention relates to a fuel cell based on inter-plate counter current coolant flow field that belongs to fuel cell technical field. In the invention, a fuel cell has coolant flow fields in two characters, and in flow passage groove of the two coolant flow fields, the coolant flows in opposite direction, but in flow passage groove of the same flow field, the coolant flows in identical direction; applying the two flow fields to between each membrane electrode alternately to form inter-plate counter current coolant flow field. Each coolant flow all has two pairs of import and export, but only one pair of import and export is communicate with the coolant flow passage groove in the same flow field, and the other import and export is coupled with the import and export that is communicated with the coolant flow passage groove. According to the invention rise of the membrane temperature caused by rise of the coolant flow temperature of any membrane electrode side can be counteracted by membrane temperature reduce caused by reduce of the coolant flow temperature of another side, so as to make any sub area in membrane electrode active zone at almost same temperature.

Description

technical field [0001] The invention relates to a fuel cell based on a counterflow coolant flow field between plates, and belongs to the technical field of fuel cells. Background technique [0002] There are two ways to cool the proton exchange membrane fuel cell stack: external cooling and internal cooling. External cooling is suitable for small-scale batteries, as reported in J. Power Sources 190(2009) 83-85; internal cooling is the most commonly used cooling method for fuel cells, and it is suitable for batteries of all sizes. The internal cooling device is composed of a motor, a pump, a radiator outside the battery, a coolant flow field inside the battery, connecting pipes, etc. Among them, the coolant flow field inside the battery is the key to the internal cooling technology. [0003] The coolant flow field of a fuel cell cell is a coolant flow channel composed of many grooves, so it is similar to the reactant flow field. The coolant flow field can be integrated in t...

AI Technical Summary

Problems solved by technology

These two same features mean that the previous internal cooling is relatively simple in structure and easier to process and install; but these two same features also mean that the cooling effect of the battery is not ideal, because the fluid in all monomers The coolant flow field follows exactly the same path from the inlet to the outlet, thus forming a parallel flow of the coolant fluid between the coolant flow field plates, which will inevitably lead to a gradual increase in the temperature of the coolant fluid along the process flow. As a result, the temperature of the proton exchange membrane also gradually increases along with the flow of the coolant fluid, which leads to different membrane temperatures in each micro-region of the active region of all fuel cell cells, which eventually leads to a change in the current density distribution. uneven

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