Siemens Aktiengesellschaft

Rittmar Von Helmolt

Peter Buchner

Joachim Wecker

Konrad Mund

Manfred Waidhas

Horst Gr&uuml;ne

Georg Neumann

A heat exchange cell and to a method of utilizing the waste heat of an air-cooled fuel cell battery is described. The heat exchange cell is of a configuration similar to that of the fuel cell and, in the stack, should directly adjoin the fuel cell battery, so that the spent cooling air is utilized to heat a medium without an intermediate line.

Apparatus and method for utilizing the waste heat of an air-cooled fuel cell battery

A polymer electrolyte membrane fuel cell system uses a wetting and/or cooling with a liquid medium. A liquid distributor is provided in one or both axial process gas supply lines. The liquid distributor uses acoustic waves for producing droplets directly in front of the gas inlet of each fuel cell unit of a fuel cell stack and feeds the droplets to the process gas flow.

Polymer electrolyte membrane fuel cell system and method for wetting and/or cooling a fuel cell stack

The invention is directed to a battery with liquid cooling composed of at least two fuel cells that respectively comprise a negative pole plate, a membrane electrode unit and a positive pole plate that are connected to one another mechanically rigidly, gas-tight and electronically insulating by a frame element, whereby the battery is immersed into a coolant bath.

Liquid-cooled fuel cell battery

A cooling system for a battery of fuel cells that contains at least two fuel cells, each of which comprises a membrane-electrode unit and two collector plates is disclosed. Cooling cards supplied with coolant and that are connected to one another via lines are thereby arranged between the individual fuel cell units.

Cooling system for a fuel cell battery

The invention is directed to an intermediate element for thermal, electrical and mechanical connection of two parts, particularly two fuel cells. The intermediate element is corrugated and each corrugation is respectively multiply interrupted along its wave hill/wave valley and is coined upward and downward in alternation.

Intermediate element for thermal, electrical and mechanical connection of two parts

A magnetoresistive sensor may be constructed with material having a perovskite-like crystal structure and an increased magnetoresistive effect. The material is based on the composition (A1).sub.1-x (A2).sub.x MnO.sub.z, with A1 (trivalent) selected from Y, La, or a lanthanide, A2 (bivalent) from an alkaline-earth metal or Pb, and with 0.1.ltoreq.x.ltoreq.0.9 and 2.0.ltoreq.z.ltoreq.3.5. The sensor contains a layer system with at least two layers with different materials, but in each case in the context of the aforesaid composition, which is selected so that the temperature correlation of the electrical resistance is relatively small. The two layers of the layer system can also be united into a single layer structure with a concentration gradient.

Magnetoresistive sensor utilizing a sensor material with a

A method for preparing a structure having enhanced magneto-resistance, and use of the structure, in which it is possible to prepare a structure having enhanced magnetoresistance on the basis of the system of materials Cu--Co, especially for a magnetoresistive sensor. An intermediate of the structure is formed initially from an alloy having Cu mixed crystals supersaturated with Co by means of a rapid-solidification technique and this intermediate is subsequently converted by means of a predefined heat treatment into an end product of the desired structure having precipitations of or including Co in a Cu matrix.

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Erlangen, Germany

Rittmar Von Helmolt