Teknologian Tutkimuskeskus Vtt Oy

Powercell Sweden Ab

Jari Ihonen

Anders Tenstam

Thomas Tingelöf

Frederic Jaouen

Henri Karimäki

Timo Keränen

Andreas Bodèn

Kaj Nikiforow

Axel Baumann Ofstad

Thomas Tingelof

Andreas Boden

Andreas BODÉN

Henri KARIMÄKI

Timo KERÄNEN

Thomas TINGELÖF

The invention relates to a method of determining water accumulation in and or removal from a fuel cell, the method comprising circulating fuel gas in the anode side of the fuel cell for producing electric energy in a fuel cell process, providing at least two purge pulses from the fuel circulation, analyzing the composition and/or volume of purged gas of said at least two gas purge pulses for determining the amount of water accumulation in and/or removal from the fuel cell.

Methods relating to monitoring fuel cells

The invention relates to a system and a method for eliminating reverse current decay in the fuel cells. According to the invention, the system comprises The bypass line is adapted to receive and circulate a flow of hydrogen during a fuel cell shutdown in order to mix the hydrogen with any oxygen present in the anode system, and to remove the oxygen from the anode system in said oxygen reduction unit by catalytic conversion. A control unit for receiving sensing signals representative of the state of the oxygen reduction process and controlling the amount of hydrogen passing through the system in response to said sensor is also described.

Method and system for eliminating reverse current decay in fuel cells

A flow field plate for a bipolar plate or bipolar plate assembly of a fuel cell or a fuel cell stack has an electrode facing front side, a backside and at least a cooling fluid manifold for supplying cooling fluid to the flow field plate. The backside includes a cooling fluid flow field for substantially uniformly distributing the cooling fluid over the flow field plate. The flow field plate further includes a cooling fluid sub-manifold which is adapted to provide cooling fluid from the cooling fluid manifold to a cooling fluid flow field. The cooling fluid sub-manifold is fluidly disconnected from the cooling fluid flow field, a bipolar plate or bipolar plate assembly including a flow field plate, as well as a fuel cell or fuel cell stack including such a flow field plate and/or bipolar plate or such a bipolar plate assembly.

Flow field plate for a fuel cell

A polymer electrolyte fuel cell structure includes a proton exchange membrane (). An anode catalyst layer () is located on one side of the proton exchange membrane. A cathode catalyst layer () is located on the opposite side of the proton exchange membrane, and a gas distribution layer () is arranged on each side of the proton exchange membrane (). The anode side gas distribution layer () is a flat, porous structure having water channels () formed in the surface facing the membrane (). The anode side gas distribution layer () is enclosed by a coplanar, sealing plate () with water inlet channels coupled to the water channels () in the gas distribution layer.

Polymer fuel cell structure

Growing community of inventors

Espoo, Finland

Jari Ihonen