Abstract: A method for assembling an electrochemical cell stack is proposed, which has the following steps: assembling a first stack component (140), which has a first adjustment opening (115), on an electrochemical substack through cooperation between the first adjustment opening (115) and a first adjustment device (110). Repositioning the first adjustment device (110) in the construction direction of the electrochemical substack for locally adjusted assembly of a second stack component, which has a corresponding first adjustment opening for locally adjusted assembly.

Abstract: A bipolar plate (10) for a fuel cell unit comprising: a first plate (59), a second plate (60), wherein the first plate (59) and second plate are stacked on top of each other, a fluid opening (57) for supplying coolant to channels (14) of the bipolar plate (10) for coolant in an active region (80), a fluid opening (58) for discharging coolant from channels (14) of the bipolar plate (10) for coolant in the active region (80), channel structures (29) with the channels for fuel, oxidants and coolants in the active region (80), wherein the channels for coolant are formed in the active region (80) between the first and second plate (59), an outer bead (63) which is formed on an outer edge region (62) of the bipolar plate (10) and encloses the fluid opening (57) for supplying coolant and the fluid opening (58) for discharging coolant, a coolant supply bead (65) which encloses the fluid opening (57) for supplying coolant to channels of the bipolar plate (10) for coolant, a coolant discharge bead (66) which encloses t

Abstract: The invention relates to a print head for a 3D printer comprising a housing, a device for supplying a metal, a piston, a reservoir with an outlet opening and an actuator device, the housing comprising at least a cooling flange, an insulating plate and the reservoir. The reservoir is connected to the cooling flange and/or the insulating plate by a centering device comprising a flange, a clamping device and a centering sleeve, an active surface connects the reservoir to the flange such that the reservoir is concentrically aligned with respect to the cooling flange and/or the insulating plate, the clamping device connects the flange to the cooling flange and/or the insulating plate, and the centering sleeve is arranged in the cooling flange and/or the insulating plate such that the centering sleeve centrally aligns the piston with respect to the reservoir.

Abstract: The invention relates to an electrode board, i.e. a cathode board or an anode board, for a bipolar plate (100) of a fuel cell stack, in particular for a fuel cell vehicle, said electrode board comprising a board alignment device (110/120) for aligning this electrode board (101/102) with respect to a second electrode board (102/101) corresponding thereto using the board alignment device (120/110) of the second electrode board during an assembly of the two electrode boards (102/101) to form the bipolar plate (100), wherein the board alignment device (110/120) at least partially forms a section (110/120) of a bipolar plate positioning device (105; 110, 120) of the bipolar plate (100) for stacking the bipolar plate (100) to form a fuel cell stack (10).

Abstract: The present invention relates to a fluid-conducting structure (50) for an electrochemical energy converter (11), having a separator plate (10) with a coolant passage opening (12, 13), a coolant passage bead (14, 15) at the coolant passage opening (12, 13), an active field (16) with a guide structure for guiding the coolant, an edge bead (17) which extends next to the active field (16) and next to the coolant passage bead (14, 15), a channel structure (41) between the coolant passage opening (12, 13) and the edge bead (17) for conducting a sealant (42) through the channel structure (41) into the edge bead (17), an inlet opening (43) for introducing the sealant (42) into the channel structure (41) in a stacking direction (39), and a deflection section (44) for deflecting the introduced sealant (42) from the stacking direction (39) into a transverse direction (40) as far as the edge bead (17).

Abstract: The invention relates to a fuel cell stack (100) having at least one fuel cell (101) which has a membrane (CCM) for separating an anode side (A) of the fuel cell (101) from a cathode side (K) of the fuel cell (101), an anode-side gas diffusion layer (GDLA), a cathode-side gas diffusion layer (GDLK) and a bipolar plate (BPP) for separating the fuel cell (101) from an adjacent fuel cell (101) or a housing. According to the invention, the membrane (CCM) protrudes beyond the anode-side gas diffusion layer (GDLA) and the cathode-side gas diffusion layer (GDLK) in an edge region (R) located outside an active area (AF) of the membrane (CCM), and the membrane (CCM) has a centering dam (10) in the edge region (R) of the anode side (A) or of the cathode side (K).

Abstract: The invention relates to a print head (1) for additively manufacturing three-dimensional workpieces, comprising a housing (3), a device (28) for feeding a metal (14), a piston (5), a reservoir (7) with an outlet opening (10) and an actuator device (12) for displacing the piston (5), wherein the reservoir (7, 27) has a melt region (20) and a displacement body chamber (21) for a liquid phase (8) of the metal (14), wherein the melt region (20) adjoins the inert atmosphere (22) and is connected to the displacement body chamber (21) such that, as a result of the displacement of the piston (5), the liquid phase (8) of the metal (14) can be stimulated to pass through the outlet opening (10), said outlet opening (10) being mounted on an insert (11) of the print head (1). The invention is characterised in that the print head (1) comprises a device (50) for feeding a protective gas (60) to the outlet opening (10) of the print head (1).

Abstract: The invention relates to a method for the rapid manufacture of a three-dimensional workpiece from a molten material (1), in particular a molten metal, in which method the molten material (1) is supplied to a compression chamber (2) and delivered in drop form via an injector hole (4) by means of a pressure pulse which is generated with the aid of a reciprocating piston (3) that delimits the compression chamber (2). According to the invention, the compression chamber (2) is degassed before manufacturing begins and/or during a pause in the manufacturing. In a first step, ultrasonic waves are coupled into the molten material (1) in the compression chamber (2), which generate a force (FBjrk) that makes the gas in the molten material (1) sink, and in a second step, after the ultrasonic excitation has ended, the piston (3) is introduced deeper into the compression chamber (2) in order to remove the rising gas via a conduit (5) of the piston (3).

Abstract: The presented invention relates to a fuel cell stack (100) for providing electrical energy. The fuel cell stack (100) comprises a number of bipolar plates (BPP) (101) and a number of membrane electrode assemblies (MEA) (103). Respective MEA (103) of the number of MEA (103) and respective BPP (101) of the number of BPP (101) are stacked on each other in alteration. The MEA (103) and the BPP (101) each have an opening (105, 300, 400, 500), and the openings (105, 300, 400, 500) of all the MEA (103) and the BPP (101) jointly form an alignment receptacle (109) for receiving an alignment tool (107). The membrane electrode assemblies (MEA) (103) protrude, at least in parts, further into the alignment receptacle (109) than each bipolar plate (BPP) (101), so that adjacent BPP (101) surrounding one of the MEA (103) are electrically insulated from each other by said MEA (103).

Abstract: The invention relates to a method for the additive manufacturing of a three-dimensional workpiece from a liquid material (1), in which method the liquid material (1) is fed to a displacement chamber (2) and discharged in drop form via a jet hole (4) by means of a pressure pulse which is generated with the aid of a reciprocating piston (3) delimiting the displacement chamber (2). According to the invention, in order to optimise the wetting properties of at least one surface (5, 6) which delimits the displacement chamber (2) and/or the jet hole (4), sound waves are coupled into the liquid material (1) for a limited period of time with the aid of the piston (3) which is caused to vibrate for this purpose. The invention also relates to a device for carrying out the method according to the invention.

Abstract: The present disclosure relates to a production system for producing at least one electrochemical system that comprises a stack consisting of a plurality of different components which are stacked one above the other along a stacking axis of the stack, with a height dimension of each component extending along the stacking axis where the production system allows the target height of the stack to be achieved in spite of the height tolerances of the different components.

Abstract: The invention relates to a print head (1) for a 3D printer, in particular a metal printer, comprising a housing (3), a device (28) for feeding a metal (14), a piston (5), a reservoir (7, 27) with an outlet opening (10), and an actuator device (12) for displacing the piston (5), wherein the reservoir (7, 27) has a melting region (20) and a displacement body chamber (21) for a liquid phase (8) of the metal (14), wherein the melting region (20) adjoins an inert atmosphere (22) and is connected to the displacement body chamber (21) such that, as a result of the displacement of the piston (5), the liquid phase (8) of the metal (14) can be caused to pass through the outlet opening (10), said housing (3) having a multi-part design and comprising at least one cooling flange (25), an insulating plate (26), and the reservoir (7, 27).

Abstract: The invention relates to a printhead (1) for a 3D printer, particularly a metal printer, comprising a housing (3), a device (28) for supplying a metal (14), a reservoir (7, 27), a nozzle device (2) and a piston (5), the nozzle device (2) comprising a guide sleeve (11), a nozzle plate (9) provided with an outlet (10), and a clamping device (4). The nozzle plate (9) and the guide sleeve (11) are mutually elastically braced by means of the clamping device (4), and the guide sleeve (11) and the reservoir (7, 27) are mutually elastically braced by means of the clamping device (4).

Abstract: The invention relates to a piston (5) for a printhead (1) of a 3D printer, particularly a metal printer, comprising a piston rod (17) and a ram (18), the ram (18) having a discharge side (19) that has a convex or tapering surface (39). The invention also relates to a printhead (1) for a 3D printer, particularly a metal printer, comprising a housing (3), a device (28) for supplying a metal (14), a reservoir (7, 27) for a liquid phase (8) of the metal (14), a nozzle device (2) comprising a guide sleeve (11) and a nozzle plate (9), and a piston (5) according to one of the preceding claims, the ram (18), the guide sleeve (11) and the nozzle plate (9) forming a displacement chamber (21), and the ram (18) and the guide sleeve (11) forming at least one area (40) for conducting the liquid phase (8) between the reservoir (27) and the displacement chamber (21).

Abstract: The invention relates to a method of attaching a gasket (4) to a bipolar plate (12). The method comprises the steps of applying and aligning a first gasket foil (4a) to a second gasket foil (4b) having connection recesses (8), connecting the first gasket foil (4a) to the second gasket foil (4b), so that the gasket (4) is formed, placing the gasket (4) on the bipolar plate (12) so that the second gasket film (4b) with the bonding recesses (8) abuts the bipolar plate (12) and performing an embossing step in which an embossing force is applied with an embossing tool (20) in the region of the connecting recesses (8) so that an embossed adhesive point (24) is formed and the first gasket foil (4a) is bonded to the bipolar plate (12) via an adhesive means (16) arranged in the connecting recess (8) on the first gasket foil (4a).

Abstract: A method for assembling an electrochemical cell stack is proposed, which has the following steps: assembling a first stack component (140), which has a first adjustment opening (115), on an electrochemical substack through cooperation between the first adjustment opening (115) and a first adjustment device (110). Repositioning the first adjustment device (110) in the construction direction of the electrochemical substack for locally adjusted assembly of a second stack component, which has a corresponding first adjustment opening for locally adjusted assembly.

Abstract: The present invention relates to a bipolar plate (100, 200, 403, 405, 407, 409, 500) for a fuel cell, wherein the bipolar plate (100, 200, 403, 405, 407, 409, 500) comprises at least one fluid channel (101, 103, 105, 201, 203, 205, 207, 209, 501) for transporting operating fluids of the fuel cell, wherein the at least one fluid channel (101, 103, 105, 201, 203, 205, 207, 209, 501) comprises an inlet opening for introducing fluid into the at least one fluid channel (101, 103, 105, 201, 203, 205, 207, 209, 501) and an outlet opening for fluid exiting the at least one fluid channel (101, 103, 105, 201, 203, 205, 207, 209, 501), wherein the at least one fluid channel (101, 103, 105, 201, 203, 205, 207, 209, 501) comprises a first region (107, 211, 503) and at least one second region (109, 213, 507), and wherein the at least one second region (109, 213, 503) has a cross-section which is reduced compared to the first region (107, 211, 507) in order to adjust a volumetric flow of fluid which exits the outlet opening

Abstract: The invention relates to a fuel cell stack (100) having at least one fuel cell (101) which has a membrane (CCM) for separating an anode side (A) of the fuel cell (101) from a cathode side (K) of the fuel cell (101), an anode-side gas diffusion layer (GDLA), a cathode-side gas diffusion layer (GDLK) and a bipolar plate (BPP) for separating the fuel cell (101) from an adjacent fuel cell (101) or a housing. According to the invention, the membrane (CCM) protrudes beyond the anode-side gas diffusion layer (GDLA) and the cathode-side gas diffusion layer (GDLK) in an edge region (R) located outside an active area (AF) of the membrane (CCM), and the membrane (CCM) has a centering dam (10) in the edge region (R) of the anode side (A) or of the cathode side (K).

Abstract: The invention relates to a print head (1) for a 3D printer, in particular a metal printer, comprising a housing (3), a device (28) for feeding a metal (14), a piston (5), a reservoir (7, 27) with an outlet opening (10) and an actuator device (12) for displacing the piston (5), wherein the reservoir (7, 27) has a melt region (20) and a displacement body chamber (21) for a liquid phase (8) of the metal (14), wherein the melt region (20) adjoins an inert atmosphere (22) and is connected to the displacement body chamber (21) such that, as a result of the displacement of the piston (5), the liquid phase (8) of the metal (14) can be stimulated to pass through the outlet opening (10), said housing (3) having a multi-part design and comprising at least one cooling flange (25), an insulating plate (26) and the reservoir (7, 27). The invention is characterized in that the reservoir (7, 27) is connected to the cooling flange (25) and/or theinsulating plate (26) by a centering device (50).

Abstract: The invention relates to a device (100) for the additive manufacture of three-dimensional workpieces, in particular a 3D metal printer, comprising a print head (1) and a device (40) for generating an inert atmosphere (22) within the print head (1) by means of a gas (55), in particular inert gas, wherein the print head (1) comprises a housing (3), a device (28) for feeding a metal (14), a piston (5), a reservoir (7) with an outlet opening (10) and an actuator device (12) for displacing the piston (5), wherein the reservoir (7) has a melt region (20) and a displacement body chamber (21) for a liquid phase (8) of the metal (14), wherein the melt region (20) adjoins the inert atmosphere (22) and is connected to the displacement body chamber (21) such that, as a result of the displacement of the piston (5), the liquid phase (8) of the metal (14) can be caused to pass through the outlet opening (10).