Fuel cell system

Abstract

Provided is a fuel cell system, in which the capacity component of a fuel cell is charged with an excess power (Ws) corresponding to the difference between the generation quantity (Pmes) of the fuel cell and a generation command value (Pref) by raising the output voltage of the fuel cell, if a generation command value (Pref) to the fuel cell is abruptly reduced while the fuel cell is being warmed by a low-efficiency run having a generation efficiency lower than that of the ordinary run. The fuel cell system equalizes an electric power (Pmes - Ws) to be fed to an external load of the fuel cell and the generation command value (Pref). As a result, the control can be made not to feed the excess power to the external load when the electric power requested on the fuel cell abruptly drops at the low-efficiency run.

Description

Technical field

[0001] The present invention relates to a fuel cell system that uses low-efficiency operation to preheat a fuel cell. Background technique

[0002] A fuel cell is a power generation system that directly converts the energy released by the oxidation reaction into electrical energy by oxidizing fuel through an electrochemical process. It has a stacked structure in which a plurality of membrane-electrode assemblies are stacked. The membrane-electrode assembly A pair of electrodes made of a porous material sandwich both sides of an electrolyte membrane for selectively transporting hydrogen ions. Among them, a solid polymer electrolyte fuel cell using a solid polymer membrane as an electrolyte is low in cost, easy to miniaturize, and has a high output density, so it is expected to be used as an on-board power source.

[0003] This type of fuel cell usually regards 70 to 80°C as the optimal temperature region for power generation. However, in environments such as cold re...

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