There are recesses in a frame area to define a structure of recesses that is in an inner area and does not relate to the recesses in the frame area. This produces a chamber plate element (2) underneath and a fluid channel structure that has a mechanical br...

The heat lock is used with a connecting device including a counter-piece (20) and a bleeding device, so that the closing device can be bled via the counter-piece. The heat lock itself (5, 6, 7) operates when the boundary temperature is exceeded, so that it...

The method involves monitoring the flow of fuel into the fuel cell system and/or monitoring the fuel reserves in a fuel reserve container (3) which the fuel cell system supplies with fuel. A signal is output if the flow of fuel is not sufficient to supply ...