Daimler Ag

Deutsche Automobilgesellschaft Mbh

Daimler Chrysler Ag

Deutsche Automobilgesellschaft

Deutsche Automobilgesellshaft Mbh

Gerhard Berger

Gabor Benczur-Urmossy

Klaus Von Benda

Norbert Wiesheu

Jens Intorp

Wolfgang Weger

Sven Schnetzler

Gert Hinsenkamp

Patrick Mangold

Jochen Schaefer

Arnold Lamm

Thomas Beisswenger

Thomas Poschmann

Rainer Klink

Gerhard Konrad

Uwe Gierz

A moisture exchange module includes a bundle of moisture-permeable hollow fiber membranes. It is provided with a feedline for supplying a gas stream that flows through the hollow fiber membranes in an inner flow. According to the present invention, a separating device for separating out liquid particles from the gas flow are provided in the region between the feedline and the bundle of hollow fiber membranes. The separating device may have the form of a groove and are arranged in such a way that the gas flow is guided in such a manner that the centrifugal force assists movement of the liquid particles towards the separating device. The moisture exchange module preferably forms part of a fuel cell system to humidify feed air for the fuel cell system.

Moisture exchange module having bundle of moisture permeable hollow fibre membranes

A moisture exchange module includes a bundle of moisture-permeable hollow fiber membranes through which a first gas stream can flow. The bundle of hollow fiber membranes is arranged in a housing, the housing being provided with line elements for supplying and discharging a second gas stream, which flows around the hollow fiber membranes. Between the bundle of hollow fiber membranes and the housing there is at least one flow space, which extends over at least approximately the entire length of that region of the bundle of hollow fiber membranes through which the first gas stream can flow. The at least one flow space surrounds only a small part of the circumference of the bundle of hollow fiber membranes, so that ultimately a moisture exchange operated in cross-current mode is formed. This can preferably be used for the humidification of feed air for fuel cell systems.

Moisture exchange module having a bundle of moisture-permeable hollow fibre membranes

An apparatus for humidifying a gas stream includes a humidifier device having at least one membrane permeable to water vapor. The gas stream and a humid gas stream flow through a humidifier device, being separated from one another by the at least one membrane. The apparatus includes at least one bypass line configured to route at least part of one of the gas stream and the humid gas stream so that it does not come into contact with the membrane. In addition a method for humidifying a gas stream, includes flowing the gas stream through a humidifier having a membrane permeable to water vapor, flowing a humid gas stream through the humidifier separated by the membrane, and routing at least a portion of one of the gas stream and the humid gas stream using a bypass line so that it does not come into contact with the membrane, and varying a quantity of the portion so as to set a predetermined dew point in the gas stream.

Device and method for humidifying a gas flow

A moisture exchange module has a bundle of moisture-permeable hollow fiber membranes and at least one line element for supplying a gas stream that flows through the hollow fibers in an inner flow. The at least one line element opens out into an inflow region, which is of at least approximately the same cross section as the bundle of hollow fiber membranes. According to the present invention, the at least one line element opens out into the inflow region at an angle of from 60&#xb0; to 120&#xb0; with respect to the longitudinal axis of the bundle of hollow fiber membranes without the longitudinal axes of the one line element and of the bundle of hollow fiber membranes intersecting one another. An annular diverter means for diverting the gas flow are provided between the cross section of the line elements through which gas can flow and the inflow region. The diverter means are arranged in such a way that an annular gap is formed, which annular gap is connected to the at least one line element and, on its side remote from the bundle of hollow fiber membranes, is connected to the inflow region.

A membrane module for hydrogen separation includes a stack of flat membrane packs disposed adjacent one another so as not to exert a force on one another and a rotationally symmetrical pressure shell enclosing the stack of flat membrane packs. A feed space for a reformate gas is disposed between every two membrane packs in the stack. Each membrane pack has a pair of membrane assemblies and a support structure disposed therebetween and each membrane assembly includes a hydrogen-selective flat membrane supported by at least one membrane frame.

Membrane module for hydrogen separation

An aqueous cadmium oxide paste of high flowability for the vibration filling of foam-structure and fiber-structure electrode plaques is characterized by a cadmium oxide content of about 25 to 35% by volume, a pH of about 10 to 12.5, a content of about 0.5 to 2.5% by weight, based on cadmium oxide, of one or more dispersants from the group comprising the water-soluble salts of polyphosphoric acids, di- and polyphosphonic acids and their derivatives, gluconic acid or of antimonyl tartrate. The paste has a plastic viscosity of about 0.1 to 1 Pa.s and also a yield value of between about 10 and 120 Pa. This cadmium oxide paste makes it possible to fill foam-structure and fiber-structure electrode plaques completely in one operation.

Vibration filling of foam-structure and fiber-structure electrode

Aqueous cadmium oxide paste of high flowability for the vibration

An alkaline nickel-cadmium storage battery in which the active material with which the negative electrode is filled with, or the electrolyte in the storage battery, contains polyvinylpyrrolidone as an expander. Polyvinylpyrrolidone compounds having a mean molecular weight of 5,000 to 35,000 g/mol have proved particularly advantageous.

Nickel-cadmium storage battery with improved electrical properties

A nickel-cadmium storage battery with improved electrical properties is described in which one or more copolymers of vinyl pyrrolidone is/are added as expander to the active material with which the negative electrode is filled or to the electrolyte. The polymers have a mean molecular weight of 10,000 g/mol to 100,000 g/mol, with a vinyl pyrrolidone content of between 5 and 95 mol-%. The copolymers are added to the active material or to the electrolyte in an amount of 0.1 to 1.0% by weight, based on the active material. As a result of adding the copolymers, a malfunction-free operation of the storage battery is achieved, accompanied by a simultaneously equally as good degree of utilization of the cadmium active material compared with a storage battery which contains homopolymeric polyvinyl pyrrolidone.

Nickel-cadium storage battery with improved electrical properties

An aqueous nickel-hydroxide paste of high flowability for the vibration filling of foam-structure and fiber-structure electrode plaques has a content of about 30 to 50% by volume of nickel hydroxide, a maximum particle size of about 0.04 mm, a plastic viscosity of about 0.1 to 1 Pa.s and a yield value of between about 10 and 120 Pa, a pH of between about 9 and 12 and a content of about 0.5 to 5, in particular about 1 to 5, % by weight, based on the nickel hydroxide content, of a dispersant from the group comprising the water-soluble salts of polhphosphoric acids or di- and polyphosphonic acids and their derivatives. Very particularly suitable as a dispersant is 1-hydroxyethane-1, 1-diphosphonic acid in the form of its cobalt/alkali salt complex. This paste makes it possible to completely fill foam-structure and fiber-structure electrode plaques in one operation.

Aqueous nickel hydroxide paste of high flowability

A gas tightly sealed nickel-cadmium cell is provided which works on the oxygen cycle principle and has a charge and discharge reserve at the negative electrode. Further, the partial pressure of the gases which cannot be reacted in the cell is below 0.4 bar. As a result of this substantial removal of the gases which cannot be reacted from the interior space of the cell, there is a considerable rise in the oxygen consumption rate, i.e., the rate at which the oxygen generated in the cell is reacted at the negative electrode, so that higher charge current densities are possible.

Growing community of inventors

Ebersbach, Germany

Gerhard Berger