Abstract: The aim of the invention is to improve an arrangement which comprises several flat components in particular for a fuel-cell device, wherein at least two flat components are welded together by means of at least one weld seam that extends along a weld contour. According to the invention, in at least one weld seam, at least two partial weld seam portions at least partially overlap in a region of overlap along the weld contour.

Abstract: In order to create a bipolar plate for an electrochemical unit of an electrochemical device comprising a plurality of electrochemical units, wherein the bipolar plate comprises an anode gas flow field, a cathode gas flow field, and a coolant flow field, wherein the anode gas flow field comprises anode gas flow channels that are able to be flowed through by the anode gas, the cathode gas flow field comprises cathode gas flow channels that are able to be flowed through by the cathode gas, and the coolant flow field comprises coolant flow channels that are able to be flowed through by the coolant, in which bipolar plate the bipolar plate layers are materially bondable to one another without impairing the cooling function of the bipolar plate, it is proposed that at least one anode gas flow channel and/or at least one cathode gas flow channel is locally expanded by at least one adjacent portion of a coolant flow channel being locally displaced along a transverse direction of the anode gas flow channel and or t

Abstract: In order to create a method for connecting, by a material joint, a first bipolar plate layer and a second bipolar plate layer of a bipolar plate for an electrochemical unit of an electrochemical device comprising a plurality of electrochemical units that follow one another along a stack direction, wherein the method comprises the following: bringing the first bipolar plate layer and the second bipolar plate layer into contact with one another at one or more contact regions of the bipolar plate layers; applying a clamping force to the first bipolar plate layer and the second bipolar plate layer by means of one or more clamping tools; and connecting the first bipolar plate layer and the second bipolar plate layer by a material joint along a connection seam; which method makes it possible to reliably connect the two bipolar plate layers to one another without deteriorating the flow properties of the bipolar plate or impairing the supporting function of the bipolar plate for parts of the electrochemical units

Abstract: The invention relates to an arrangement, in particular an arrangement for a fuel cell device, of a plurality of flat components arranged on top of one another in an arrangement direction, wherein at least one flat component of the plurality of flat components has at least one adjustment mark, and the adjustment mark can also be detected by a detection means, in particular an optical detection means, even when at least one further flat component is arranged in the arrangement direction on top of the flat component marked with this adjustment mark.

Abstract: Proposed is a bipolar plate for a fuel cell device, wherein the bipolar plate is formed from a plurality of flat products, in particular arranged one above the other in a vertical direction, wherein one or each of at least some of the plurality of flat products has an alignment structure or a plurality of alignment structures, and at least one alignment structure of at least one flat product, at least in the state in which the plurality of flat products are arranged one above the other, is accessible and/or is exposed by the other one or more of the plurality of flat products.

Abstract: A bipolar plate for an electrochemical device, including a first bipolar plate layer and a second bipolar plate layer joined by a weld seam arrangement, wherein the first bipolar plate layer has a first and a second medium passage opening. The weld seam arrangement includes a first and a second medium channel weld seam, and a connecting weld seam which crosses the first and the second medium channel weld seams. Either a) the connecting weld seam is produced by a welding energy source which the first bipolar plate layer faced during the welding process, and the weld seam end of the connecting weld seam lies within the medium-conducting region of the bipolar plate which is surrounded by the first medium channel weld seam, and/or b) the connecting weld seam crosses the first medium channel weld seam and/or the second medium channel weld seam at least twice in each case.

Abstract: A bipolar plate for an electrochemical device, including a first bipolar plate layer and a second bipolar plate layer joined by a weld seam arrangement, wherein the first bipolar plate layer has a first and a second medium passage opening. The weld seam arrangement includes a first and a second medium channel weld seam, and a connecting weld seam which crosses the first and the second medium channel weld seams. Either a) the connecting weld seam is produced by a welding energy source which the first bipolar plate layer faced during the welding process, and the weld seam end of the connecting weld seam lies within the medium-conducting region of the bipolar plate which is surrounded by the first medium channel weld seam, and/or b) the connecting weld seam crosses the first medium channel weld seam and/or the second medium channel weld seam at least twice in each case.