A fuel cell stack including a cell stacked body having power generation cells, a guide part protruding from inner wall of a case toward the cell stacked body, a positioning portion provided on an edge portion of the power generation cell to position the power generation cell relative to the case. The positioning portion includes first and second protruding portions from first and second edge portions of the power generation cell, the guide part includes a first guide part provided on one side in a first direction of the first protruding portion and a second guide part on the other side in the first direction of the second protruding portion, and the first and second guide parts include a first and second abutting surface abutting a first and second end surface of the first and second protruding portions.

A method for producing a multi-layer bipolar plate for an electrochemical device is disclosed. The method includes producing at least one sealing element made of an elastic material on a first bipolar plate layer of the bipolar plate; connecting the first bipolar plate layer with the sealing element produced thereon and a second bipolar plate layer of the bipolar plate by welding along at least one connection welding seam, in which method an impairment to the sealing element produced on the first bipolar plate layer as a result of a subsequent welding operation can be reliably avoided and the freedom of design of the electrochemical unit is preferably increased, and that during the welding operation, the second bipolar plate layer faces toward a welding energy source and that during the welding operation, a weld pool produced by the welding energy source does not completely penetrate the first bipolar plate layer.

A method for producing a multi-layer bipolar plate for an electrochemical device is disclosed. The method includes producing at least one sealing element made of an elastic material on a first bipolar plate layer of the bipolar plate; connecting the first bipolar plate layer with the sealing element produced thereon and a second bipolar plate layer of the bipolar plate by welding along at least one connection welding seam, in which method an impairment to the sealing element produced on the first bipolar plate layer as a result of a subsequent welding operation can be reliably avoided and the freedom of design of the electrochemical unit is preferably increased, and that during the welding operation, the second bipolar plate layer faces toward a welding energy source and that during the welding operation, a weld pool produced by the welding energy source does not completely penetrate the first bipolar plate layer.

An electrochemical cell includes an element portion, a support body made of metal, and an oxide layer. The element portion includes a solid electrolyte layer, and a first electrode and a second electrode with the solid electrolyte layer therebetween. The support body contains chromium and supports the element portion. The oxide layer is located between the first electrode and the support body and contains a metal component. The oxide layer has a porosity lower than that of the first electrode.

An electrochemical cell includes an element portion, a support body made of metal, and an oxide layer. The element portion includes a solid electrolyte layer, and a first electrode and a second electrode with the solid electrolyte layer therebetween. The support body contains chromium and supports the element portion. The oxide layer is located between the first electrode and the support body and contains a metal component. The oxide layer has a porosity lower than that of the first electrode.

An electrochemical device may include an attachment device, a plurality of stackable electrochemical cells, and an operating device. The plurality of electrochemical cells may be arranged in a stack starting from a first attachment zone of the attachment device along a first normal axis and form a first cell stack. The plurality of electrochemical cells may be arranged in a stack starting from a second attachment zone of the attachment device along a second normal axis and form a second cell stack. The attachment device may include a common support element. The first attachment zone and the second attachment zone may be jointly arranged on the common support element.

An electrochemical device may include an attachment device, a plurality of stackable electrochemical cells, and an operating device. The plurality of electrochemical cells may be arranged in a stack starting from a first attachment zone of the attachment device along a first normal axis and form a first cell stack. The plurality of electrochemical cells may be arranged in a stack starting from a second attachment zone of the attachment device along a second normal axis and form a second cell stack. The attachment device may include a common support element. The first attachment zone and the second attachment zone may be jointly arranged on the common support element.

A fuel cell stack includes a reaction part configured by stacking a plurality of unit cells, a plurality of endplates configured to cover ends of the reaction part in a stacking direction of the unit cells, and a clamp including a clamp body configured to cover an outer surface of the reaction part in the stacking direction of the unit cell and a plurality of hook portions connected to ends of the clamp body so as to cover outer surfaces of the plurality of endplates and be restricted directly by the endplates.

A fuel cell stack includes a reaction part configured by stacking a plurality of unit cells, a plurality of endplates configured to cover ends of the reaction part in a stacking direction of the unit cells, and a clamp including a clamp body configured to cover an outer surface of the reaction part in the stacking direction of the unit cell and a plurality of hook portions connected to ends of the clamp body so as to cover outer surfaces of the plurality of endplates and be restricted directly by the endplates.

A fuel cell assembly includes a first bipolar plate, a second bipolar plate, and a diffusion-electrode assembly. A first top surface of the first plate includes a first seal protruding upwardly and a first raised feed channel adjacent the first seal and protruding upwardly. A second bottom surface of the second plate includes a second seal protruding downwardly and a second raised feed channel adjacent the second seal and protruding downwardly. The diffusion-electrode assembly includes a membrane layer having a membrane frame extending therefrom and two gas diffusion layers. The first and second plates are arranged parallel, the first and second seals align with each other, and the first and second raised feed channels align with each other. The first and second raised feed channels contact the membrane frame arranged therebetween so as to prevent mechanical deformations of the first and second plates.