Fuel cell stack

Abstract

The invention provides a fuel cell stack having dummy cells to achieve the desired heat insulating capability, reliably prevent condensed water from flowing into power generation units, and achieve good power generation performance with a simple structure. The fuel cell stack includes a stack body formed by stacking a plurality of power generation units. A first end power generation unit and first dummy units are provided near an end plate where reactant gas pipes for the stack body are provided. A second end power generation unit and second dummy units are provided near an end plate of the stack body on the opposite side. The number of first dummy units is larger than the number of second dummy units.

Description

technical field [0001] The present invention relates to a fuel cell stack comprising a laminated body in which power generating units are stacked, the power generating unit has an electrolyte and electrode structure in which a pair of electrodes are arranged on both sides of the electrolyte, and a separator is provided along the electrode surface reaction gas flow path, and the stacked body is formed with a reaction gas communication hole communicating with the reactant gas flow path and extending in the stacking direction of the power generation unit, and terminal plates, The insulating plate and the end plate are connected to one end plate with a reaction gas pipe communicating with the reaction gas communication hole. Background technique [0002] For example, a solid polymer fuel cell includes a power generation cell in which an electrolyte membrane and an electrode structure are sandwiched between separators. The electrolyte membrane and the electrode structure are resp...

AI Technical Summary

Problems solved by technology

[0011] However, there is a problem in the fuel cell stack 6 that if the operation is stopped and then started after soaking (standing) for a long time, the voltage of the module 1 close to the end plate 5 with the tube 7 in particular on the fluid supply side drops, causing the fuel cell stack 6 to start. sexual deterioration

[0012] This is because poor distribution of fuel gas and oxidant gas is likely to occur in the module 1 on the side of the pipe 7, and dew condensation water cannot be sufficiently removed on the layer 2 to be introduced into the module 1. In addition, it also affects the junction. Dew retention and uneven surface pressure, etc.

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