A fuel cell system includes a fuel cell stack, a stack case storing the fuel cell stack, and an auxiliary device case joined to the stack case, and storing fuel cell auxiliary devices. The auxiliary device case includes an end plate part which applies a tightening load in a stacking direction to the fuel cell stack, as an integral part of the auxiliary device case.

A fuel cell system includes a fuel cell stack, a stack case storing the fuel cell stack, and an auxiliary device case joined to the stack case, and storing fuel cell auxiliary devices. The auxiliary device case includes an end plate part which applies a tightening load in a stacking direction to the fuel cell stack, as an integral part of the auxiliary device case.

A fuel cell device includes a housing defining an inner space, a runner plate disposed in the inner space, two electrode plates disposed in the inner space such that the runner plate is stacked on and in contact with one of the electrode plates, and a proton exchange membrane clamped between the electrode plates. The runner plate includes a plurality of straight sections arranged in two rows, and a plurality of connecting sections. Each two adjacent straight sections define an opening therebetween. The openings in the two rows are staggered with respect to each other. Each two adjacent connecting sections are connected to and cooperate with a common straight section to define a drain channel communicating with the opening that aligns with the common straight section.

The fuel cell unit comprises a fuel cell stack, a power converter configured to convert the power of the fuel cell stack, and a case configured to accommodate the fuel cell stack and the power converter in the same space. The power converter is configured to be disposed below the fuel cell stack.

The fuel cell unit comprises a fuel cell stack, a power converter configured to convert the power of the fuel cell stack, and a case configured to accommodate the fuel cell stack and the power converter in the same space. The power converter is configured to be disposed below the fuel cell stack.

A cell stack device according to the present disclosure includes: a cell stack comprising a plurality of cells; and a manifold configured to supply reaction gas to the plurality of cells, wherein each of the plurality of cells includes: an element part comprising: a fuel electrode layer that is located on the fuel electrode layer; a solid electrolyte layer that is located on the fuel electrode layer; a middle layer that is located on the solid electrolyte layer; and an air electrode layer that is located on the middle layer, the middle layer including: a first middle layer bonded to the solid electrolyte layer; and a second middle layer bonded to the air electrode layer; and a non-element part of the cell that comprises the entire cell excluding the air electrode layer, the non-element part located at least at a first of both ends of the plurality of cells in a longitudinal direction, and the plurality of cells is fixed to the manifold at least at the first end by a sealing material located between the manifold and either the solid electrolyte layer or the first middle layer.

A cell stack device according to the present disclosure includes: a cell stack comprising a plurality of cells; and a manifold configured to supply reaction gas to the plurality of cells, wherein each of the plurality of cells includes: an element part comprising: a fuel electrode layer that is located on the fuel electrode layer; a solid electrolyte layer that is located on the fuel electrode layer; a middle layer that is located on the solid electrolyte layer; and an air electrode layer that is located on the middle layer, the middle layer including: a first middle layer bonded to the solid electrolyte layer; and a second middle layer bonded to the air electrode layer; and a non-element part of the cell that comprises the entire cell excluding the air electrode layer, the non-element part located at least at a first of both ends of the plurality of cells in a longitudinal direction, and the plurality of cells is fixed to the manifold at least at the first end by a sealing material located between the manifold and either the solid electrolyte layer or the first middle layer.

A modular flow battery includes a battery stack container housing a plurality of redox flow battery stacks in fluid communication with at least one pair of electrolyte containers including an anolyte container for holding an anolyte and a catholyte container for holding a catholyte. Additional pairs of electrolyte containers can be connected to the battery stack container to increase an amount of energy that can be stored by the modular flow battery system. Respective housings enclosing each of the battery stack container and the electrolyte containers are configured for operation in a stacked configuration. In this manner, the energy storage capacity of the modular flow battery system can be further increased with substantially no increase in a lateral area occupied by the system.

A modular flow battery includes a battery stack container housing a plurality of redox flow battery stacks in fluid communication with at least one pair of electrolyte containers including an anolyte container for holding an anolyte and a catholyte container for holding a catholyte. Additional pairs of electrolyte containers can be connected to the battery stack container to increase an amount of energy that can be stored by the modular flow battery system. Respective housings enclosing each of the battery stack container and the electrolyte containers are configured for operation in a stacked configuration. In this manner, the energy storage capacity of the modular flow battery system can be further increased with substantially no increase in a lateral area occupied by the system.

A stack case of a fuel cell system includes a case body, a first end cover, and a second end cover. A recess is formed in an upper surface of the case body. An interruption control unit as an electrical equipment unit is placed in the recess. A plurality of first screw holes are formed in one end surface of the case body, and a plurality of second screw holes are formed in the other end surface of the case body. A first screw hole aligned with a recess in a direction in which a plurality of power generation cells are stacked together penetrates through the case body from one end surface of the case body to a side surface of the recess.