Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Arjowiggins Security

Oberthur Fiduciaire Sas

Remi Vincent

Mathias Gerard

Jean-Philippe Poirot-Crouvezier

Christophe Robin

Lara Jabbour

Alejandro Franco

Denis Tremblay

Julien Tard

Pascal Schott

Sylvie Escribano

Fabrice Micoud

Sebastien Rosini

Patrick Le Gallo

Laurent Garnier

Ludovic Rouillon

Marco Bolloli

Jean-Noel Carminati

Didier Buzon

Fredy-Intelligent Nandjou Dongmeza

Laure Guetaz

Guillaume Krosnicki

Ramon Naiff Da Fonseca

Jeremie Salomon

Baptiste Verdin

Benjamin Decoopman

Benoit Barthe

The invention relates to a method for determining the dimensions of an electrochemical cell allowing a total area of the electrochemical cell to be minimized while maximizing an electrical signal generated by the electrochemical cell in operation, including: a/ determining a first cost function expressing the variation in a first parameter representative of the total area as a function of an adjustment variable representative of an aspect ratio of the active zone; b/ determining a second cost function expressing the variation in a second parameter representative of the generated electrical signal as a function of the adjustment variable; c/ determining a compound cost function from the first and second cost functions and identifying a value of the adjustment variable that optimizes the compound cost function and that therefore conjointly optimizes the first and second cost functions.

Method for determining the dimensions of an electrochemical cell comprising PCB holding plates

A fuel cell including: a membrane/electrode assembly including a proton exchange membrane and including an anode in contact with the membrane, the membrane/electrode assembly including a first active zone covered by the anode, and a first linking zone not covered by the anode; flow guiding plates between which the membrane/electrode assembly is arranged, the flow guiding plates being traversed by at least one first flow collector in communication with the anode, the first linking zone arranged between the first flow collector and the first active zone. The membrane/electrode assembly further includes a first capacitive layer including a mixture of carbon including a BET specific surface area at least equal to 200 m/g and of a proton-conducting material, arranged on the first linking zone.

Fuel cell comprising a membrane/electrode assembly provided with a capacitive layer

An electrochemical device includes at least one electrochemical cell, including a membrane electrode assembly and bipolar plates through which at least one discharge manifold passes, the membrane electrode assembly including an active zone and a connection zone; at least one hydrogen sensor including an anode positioned in the connection zone and including a catalyst suitable for ensuring the oxidation of the hydrogen, and a cathode opposite the anode; a voltage source; a current sensor; and a computing unit, suitable for detecting the presence of hydrogen from the measured value of the electric current.

Electrochemical device comprising a hydrogen sensor

A method is provided for determining a spatial distribution (R) of a parameter of interest (R) representative of the electrical power production of an electrochemical cell, including steps of determining the spatial distribution (R) the parameter of interest (R) depending on a spatial distribution (Q) of a second thermal quantity (Q) estimated beforehand from a spatial distribution (T) of a set-point temperature (T) and from a spatial distribution (D) of a first thermal quantity (D).

Determination of a spatial distribution of an electrical production parameter of an electrochemical cell

A method for producing an electrochemical cell is provided, the method including determining a spatial distribution (k) of a parameter of interest (k) representative of a permeability of a diffusion layer of at least one electrode of a reference electrochemical cell in operation, the determining being performed by defining a spatial distribution (T) of a set-point temperature (T) within the cell in operation, by measuring a spatial distribution (D) of a first thermal quantity (D) representative of local removal of heat, by estimating a spatial distribution (Q) of a second thermal quantity (Q) representative of local production of heat (Q), and by determining the spatial distribution (k) depending on the estimated spatial distribution (Q), and the method further including producing the electrochemical cell based on the reference electrochemical cell and in which the parameter of interest (k) has the determined spatial distribution (k).

Determination of a spatial distribution of the permeability of an electrochemical - cell electrode

A method for cutting an electrode of an electrochemical generator including a metal sheet with a laser beam of a power lower than or equal to 600 W, one face of the metal sheet being partially coated with a thinly layered band called the cutting band, the optical absorption factor of which for an emission wavelength of the laser beam is higher than or equal to 0.5 and preferably higher than or equal to 0.8, and extends so as to define a cutting path, in which the laser beam is focused on the cutting band and the laser beam is animated with a relative movement with respect to the electrode so as to travel the cutting path.

Method for cutting an electrode of an electrochemical generator

A fuel cell, including: first and second electrochemical cells; a two-pole plate arranged between the first and second electrochemical cells, including a conductor support delimiting a first flow channel facing the first electrochemical cell and extending between an air inlet and a water outlet, and including a first conductive coating attached to the conductor support at the air inlet of the first flow channel and including a second conductive coating fastened to the conductor support at the middle part of the first flow channel, the second conductor coating having an electrical surface resistance greater than that of the first conductive coating.

Fuel cell with optimized operation

A fuel cell including: a diaphragm/electrodes assembly including a first electrode forming an anode, and a first reinforcement attached to a surface of the diaphragm and surrounding the first electrode; two bipolar plates, having the diaphragm/electrodes assembly placed therebetween and including at least one flow collector passing therethrough, a first surface of the diaphragm including an active area and a connection area and arranged between the flow collector and the active area; a conductor track rigidly connected to the first surface of the diaphragm and extending between the connection area and one edge of the diaphragm that projects beyond the first reinforcement; and a measurement electrode, positioned on the connection area of the first surface of the diaphragm and making electrical contact with the conductor track.

Fuel cell for detecting a pollutant

A process for supplying a fuel cell with reactive species, including a stack of electrochemical cells divided into N different groups, wherein a plurality of steps of selectively supplying the N groups of cells with reactive species are carried out, following each of the supply steps, a step of purging the N groups of cells is carried out.

Process for supplying a fuel cell having alternate supply and purge phases

A method is provided for determining a spatial distribution (Wc) of a parameter of interest (Wc) representative of a catalytic activity of an active layer of at least one electrode among two electrodes of an electrochemical cell, including steps of providing the cell, within which the parameter of interest (Wc) has an initial spatial distribution (Wc) of one or more values of catalytic load; defining a spatial distribution (T) of a set-point temperature (T) within the cell in operation; measuring a spatial distribution (D) of a first thermal quantity (D) within the cell in operation; estimating a spatial distribution (Wc) of a second thermal quantity (Q) within the cell in operation, depending on the spatial distribution (T) and on the measured spatial distribution (D); and determining the spatial distribution (Wc) of the parameter of interest (Wc) depending on the estimated spatial distribution (Q) of the second thermal quantity (Q).

Determination of a spatial distribution of the catalytic activity of an electrochemical-cell electrode

The invention relates to a method for manufacturing a membrane/electrode assembly, including the steps of: providing a proton exchange membrane comprising a first electrode and a second electrode; placing a first reinforcement with an overlapping portion vertically adjacent to the periphery of the membrane, and with an extension portion made of a polymer material extending laterally beyond the membrane; placing a second reinforcement with an overlapping portion that is vertically adjacent to the periphery of the membrane, and with an extension portion of said second reinforcement extending laterally beyond the membrane and being vertically adjacent to the extension portion of the first reinforcement; applying a laser beam to the vertically adjacent extension portions such as to define an opening through the extension portions and such as to weld the extension portions.

Method for manufacturing a membrane/electrode assembly comprising reinforcements

A fuel cell includes a proton-exchange membrane, and a cathode and anode fixed on its opposite sides. The anode delimits a flow conduit between a molecular-oxygen inlet area and a water outlet area. The cathode includes a support for catalyst material. The support has first and second materials to which catalyst is fixed, the first material being a graphitized material. The second material has a resistance to corrosion by oxygen that is greater than that of the first material. A quantity of the second material at the inlet area is greater than a quantity of the second material at the water outlet. The cathode comprises a first layer including the first material and a second layer including the second material. A thickness of the second layer decreases between the molecular-oxygen inlet area and the water outlet area.

Fuel cell comprising a proton-exchange membrane, having an increased service life

A fuel cell includes three membrane-electrode assemblies. and first and second bipolar metal plates interposed between the membrane-electrode assemblies. Each of the bipolar plates comprises two metal sheets facing a respective membrane-electrode assembly and fixedly attached by welds. The two metal sheets comprise successive guiding channels for guiding gas extending in a common longitudinal direction. The guiding channels are distributed in a transversal direction The welds are made in bottoms of the guiding channel and include welds of the first bipolar plate and welds of the second bipolar plate. Some of the welds of the first bipolar plate are not superimposed on the welds of the second bipolar plate and are offset longitudinally and transversally relative to the welds of the second bipolar plate.

Fuel cell including bipolar plates having welds not superimposed with welds of adjacent bipolar plates

A fuel-cell stack includes a proton-exchange membrane, a first electrode, a second electrode, a first current-collecting metal plate, a first gas diffusion layer, and first and second layers that contact each other. The first electrode and second electrodes are fixed on corresponding sides of the membrane. The first gas diffusion layer is interposed between the first current-collecting plate and the second electrode. The first layer is fixed on the first current-collecting plate, while the second layer is fixed to the first gas diffusion layer. Both layers include a polyurethane matrix containing conductive fillers. The second layer makes contact with the first layer.

Proton-exchange membrane fuel cell having enhanced performance

An electrode for an electrochemical system, such as a fuel cell, is formed by an active layer including: pores; at least one catalyst; at least one ionomer; and electrically-conductive particles. The catalyst content per pore ranges between 30 and 500 mg/cmwith respect to the pore volume.

Growing community of inventors

Grenoble, France

Remi Vincent