A power source for an aircraft including a solid oxide fuel cell and a solid oxide fuel cell along with a solid oxide fuel cell multi-power source. At least one battery is electrically coupled to the solid oxide fuel cell, the solid oxide fuel cell, and an aircraft distribution network to supply electricity to the aircraft and also for becoming recharged by the solid oxide fuel cell and the solid oxide fuel cell.

There are provided: a solid polymer power generation or electrolysis method that does not require injection of energy from the outside and maintenance of a high temperature, and is capable of converting carbon dioxide to a useful hydrocarbon while producing energy, controlling the production amounts of the hydrocarbons or the like and a ratio sorted by kind of the hydrocarbons, improving utilization efficiency of a product, and simplifying equipment for separation and recovery; and a system for implementing the solid polymer power generation or electrolysis method. Carbon dioxide is supplied to the side of one electrode 111 of a reactor 110 having a membrane electrode assembly 113, hydrogen is supplied to the side of the other electrode 112, and the amounts of the hydrocarbons produced per unit time and the ratio sorted by kind of the hydrocarbons are changed by controlling a power generation voltage of the reactor 110.

There are provided: a solid polymer power generation or electrolysis method that does not require injection of energy from the outside and maintenance of a high temperature, and is capable of converting carbon dioxide to a useful hydrocarbon while producing energy, controlling the production amounts of the hydrocarbons or the like and a ratio sorted by kind of the hydrocarbons, improving utilization efficiency of a product, and simplifying equipment for separation and recovery; and a system for implementing the solid polymer power generation or electrolysis method. Carbon dioxide is supplied to the side of one electrode 111 of a reactor 110 having a membrane electrode assembly 113, hydrogen is supplied to the side of the other electrode 112, and the amounts of the hydrocarbons produced per unit time and the ratio sorted by kind of the hydrocarbons are changed by controlling a power generation voltage of the reactor 110.

A redox flow battery includes a series circuit having two or more cell stacks electrically connected in series. Each of the two or more cell stacks includes a cell stack input terminal and a cell stack output terminal. Each of the two or more cell stacks is provided with a bypass circuit that electrically bypasses the cell stack. Each of the bypass circuits includes a bypass circuit input terminal and a bypass circuit output terminal. The redox flow battery includes an input switch that, with respect to each of the two or more cell stacks, switches between the cell stack input terminal and the bypass circuit input terminal and an output switch that, with respect to each of the two or more cell stacks, switches between the cell stack output terminal and the bypass circuit output terminal.

A redox flow battery includes a series circuit having two or more cell stacks electrically connected in series. Each of the two or more cell stacks includes a cell stack input terminal and a cell stack output terminal. Each of the two or more cell stacks is provided with a bypass circuit that electrically bypasses the cell stack. Each of the bypass circuits includes a bypass circuit input terminal and a bypass circuit output terminal. The redox flow battery includes an input switch that, with respect to each of the two or more cell stacks, switches between the cell stack input terminal and the bypass circuit input terminal and an output switch that, with respect to each of the two or more cell stacks, switches between the cell stack output terminal and the bypass circuit output terminal.

The present application relates to a fuel cell system and a method for driving same, which can produce stable electricity, enhance load following capability, and simultaneously increasing fuel utilization rate and energy efficiency by separately managing a base load and a load following of a fuel cell, and the fuel cell system according to one embodiment of the present application comprises: a molten carbonate fuel cell for generating electricity by using fuel; a reaction gas for shifting discharge gas into water gas; a buffer tank for storing the water gas; and a driving device which is actuated by using the water gas that is stored and provided from the buffer tank.