Fuel cell stack inlet and outlet device

Abstract

The invention belongs to a fuel battery stack entrance device, composed of a flow tube, an end plate, an insulation plate, a divert plate, a sealing pad, and a dual-polar plate with coaxial holes. Theinvention is characterized in that the tubular portion of the flow tube is through the insulation plate and the end plate, the lower end face of a flange of the flow tube is through the diversion plate to be separated by the sealing pad and arranged on the upper end face of the dual-polar plate. Since the reactant is not contacted with the end plate and other elements, the invention can reduce the sealing pad number arranged for reducing reactant leakage, to simplify structure, and avoid the corrosion caused by the contact between reactant and end plate or other elements, therefore, the inletreactant of battery is pure to improve the property and service life of battery. The invention can be used in high-power fuel battery and middle and small power fuel battery, used as gas entrance andliquid entrance, to expand application range, with simple production and low cost.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, in particular to a fuel cell stack inlet and outlet device. Background technique [0002] A fuel cell is an energy conversion device that directly converts chemical energy stored in gases such as hydrogen or liquids such as methanol and ethanol as fuels, such as oxygen and air as oxidants, into electrical energy in an efficient and environmentally friendly manner. The inlet and outlet device of the battery stack is a channel device for the flow of reactants formed by fuel and oxidant in the fuel cell. When the power of the fuel cell is large, the inlet and outlet device can also be used as a channel for cooling water flow. [0003] Currently known channel device in the fuel cell: a kind of structure is to tap a threaded hole on the end plate, then screw into a stainless steel interface; another kind of structure is as follows figure 1 As shown, fix the four corners of the flange of the flow p...

AI Technical Summary

Problems solved by technology

[0004] When the fuel, oxidant or cooling water enters the inlet and outlet channels formed by the above two structures, the reactants are all in contact with the end plates. After the battery runs for a period of time, the battery end plates will be corroded, and impurities will be brought into the reactants, affecting Battery performance and life; due to the need for sealing between the interface and the end plate, the end plate and the insulating plate, the insulating plate and the flow guide, and the flow guide and the bipolar plate, the structure is complex; the second structure occupies a larger area of ​​​​the end plate , only for large stacks

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