Bayerische Motoren Werke Aktiengesellschaft

Bayerische Motoren Werke Aktiengesellscaft

Andreas Oswald Stoermer

Thomas Hoefler

Franz-Josef Wetzel

Marcus Hafkemeyer

Olav Finkenwirth

Bernd Kuhn

Maximilian Danzer

Xiaofeng Yan

Sebastian Scharner

Peter Lamp

Markus Mauerer

A vehicle includes an electric onboard power system, in which electrical components and at least one lithium-ion battery are integrated. The lithium-ion battery includes a plurality of lithium-ion cells, each lithium-ion cell is based on a cell technology, and the cell technologies of at least two lithium-ion cells are different.

Vehicle having a lithium-ion battery

A motor vehicle energy storage device includes a first electrical energy store characterized by a first characteristic voltage curve defining the open-circuit voltage of the first energy store depending on the relative charge state and by a first characteristic resistance curve defining the internal resistance of the first energy store relevant for a charge process of the energy store, and a second electrical energy store connected in parallel and characterized by a second characteristic voltage curve defining the open-circuit voltage of the second energy store depending on the relative charge state and by a second characteristic resistance curve defining the internal resistance relevant for a charge process of the second energy store. The voltage value ranges covered by the first characteristic voltage curve and the second characteristic voltage curve partially overlap, and the first and second characteristic resistance curves and the second characteristic resistance curve have exactly one intersecting point.

Energy storage device for a motor vehicle

The invention relates to a fuel cell stack which is composed of several individual fuel cells that are stacked on top of each other. Each of said fuel cells comprises a cathode-electrolyte-anode unit () and a perforated film () which distributes a combustible gas across the first electrode surface thereof, supports the cathode-electrolyte-anode unit (), and is combined into a cassette () that is provided with a hollow space along with an additional structure (). The combustible gas reaches the first electrode (A) via said cassette (). The side of each cassette (), which is located opposite the cathode-electrolyte-anode unit (), is provide with a structure for distributing atmospheric oxygen across the surface of the second electrode of a neighboring cassette such that the stack is formed by several superimposed cassettes (), between the film () of which a cathode-electrolyte-anode unit () and the structure for distributing atmospheric oxygen across the surface of the second electrode are disposed along with the additional structure (). In order to brace the individual cassettes against each other in a housing or similar, the inventive stack comprises at least one bracing cassette, the walls of which are impermeable and which is filled with a material that expands to a relatively great extent when being heated.

Fuel cell stack

A fuel cell includes a cathode-electrolyte-anode unit, and a perforated foil structure distributes fuel gas over an electrode surface thereof. Longitudinal axes of at least some of the holes forming perforations in the foil are inclined differently relative to the foil surface such that, near a fuel gas feed, the outlet openings of the holes facing the electrode are oriented at least slightly toward the area of the fuel gas outlet from the fuel cell. Near a fuel gas outlet, the inlet openings of the holes facing the electrode are oriented at least slightly to the area of the fuel gas feed. However, holes whose inlet openings facing away from the electrode are oriented toward the fuel gas feed, and holes whose outlet openings facing away from the electrode are oriented toward the fuel gas outlet, may also be arranged alternately side-by-side.

Fuel cell having a perforated foil distributing the fuel gas over the electrode surface

Growing community of inventors

Tuntenhausen, Germany

Andreas Oswald Stoermer