Fuel cell and manufacturing method therefor

Abstract

A fuel cell capable of preventing a deterioration in power generation performance of a fuel cell stack is provided. A fuel cell includes a fuel cell stack, a first pressurizing plate disposed in one of sides of the fuel cell stack, a second pressurizing plate disposed on another side of the fuel cell stack, a third pressurizing plate disposed over the second pressurizing plate, an elastic sheet disposed between the second and third pressurizing plates in a compressed state, the elastic sheet being disposed so that a surface pressure applied to the fuel cell cells is maintained at or above a predetermined threshold when the fuel cell cells creep, and a restraining member adapted to restrain the fuel cell stack between the first and third pressurizing plates in a pressurized state. The elastic sheet includes a plurality of projections.

Description

technical field [0001] The present disclosure relates to a fuel cell and a manufacturing method thereof, for example, a fuel cell constrained by a constraining member in a state where a plurality of fuel cell cells are stacked and pressurized, and a manufacturing method thereof. Background technique [0002] A typical fuel cell has stacked Figure 14 The fuel cell stack shown is the fuel cell unit. The fuel cell unit 100 is a structure in which an MEA (Membrane Electrode Assembly: Membrane Electrode Assembly) sheet 108 is sandwiched by separators 109 and 110, and the MEA sheet 108 is composed of a catalyst layer 101 on the negative electrode side, a microporous layer 102 And the gas diffusion layer 103 is formed by sandwiching the electrolyte membrane 107 with the catalyst layer 104 on the positive electrode side, the microporous layer 105 and the gas diffusion layer 106 . [0003] When such fuel cell units 100 are stacked, as disclosed in Japanese Patent Laid-Open No. 2005...

AI Technical Summary

Problems solved by technology

[0006] Even if the fuel cell is configured as in Japanese Patent Application Laid-Open No. 2005-142145, in which a plurality of fuel cell stacks are fastened with fastening tapes in advance, even if the temperature of the fuel cell stack changes in the initial state, the The fuel cell is pressurized between the load upper limit and the load lower limit, but when the fuel cell creeps over time and the surface pressure acting on the fuel cell decreases, Then, when the temperature of the fuel cell stack is low, the load applied to the fuel cell stack is lower than the lower limit value of the load, and the fuel cell stack cannot be pressurized satisfactorily.

As a result, the contact resistance within the fuel cell and the contact resistance between adjacent fuel cells increase, and there is a problem that the power generation performance of the fuel cell stack decreases.

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