Gm Global Technolgoy Operations, Inc.

Gm Global Technologies LLC

Christian Koenig

Rocco Schoene

Steven D Burch

Marc Becker

Thorsten Rohwer

Uwe Hannesen

Thomas Hild

Ulrich Dumke

Thomas Wollstadt

Erik Schumacher

A humidity sensing device for measuring a humidity of a reactant stream in a fuel cell system is provided. The humidity sensing device includes a humidity sensor coupled to a sensor housing. The sensor housing is adapted to selectively move the humidity sensor to an operating position and to a non-operating position in the fuel cell system. A fuel cell system and a method employing the humidity sensing device in the fuel cell system is also provided.

Humidity sensing device for use in fuel cell systems

A fuel cell system that employs a heat exchanger and a charge air cooler for reducing the temperature of the cathode inlet air to a fuel cell stack during certain system operating conditions so that the cathode inlet air is able to absorb more moisture in a water vapor transfer unit. The system can include a valve that selectively by-passes the heat exchanger if the cathode inlet air does not need to be cooled to meet the inlet humidity requirements. Alternately, the charge air cooler can be cooled by an ambient airflow.

Water transfer efficiency improvement in a membrane humidifier by reducing dry air inlet temperature

An air humidifier is disclosed, the air humidifier including a caseless humidification module, wherein sealing properties of the humidification module are optimized.

Fuel cell air humidifier

A compressed gas storage system with an incorporated pressure relief device is disclosed. The compressed gas storage system comprises a tank for storing a compressed gas, a battery in the direct surroundings of the tank, and a relief valve in communication with the tank. The relief valve is configured to be responsive to electrical current generated by the battery. The battery is configured to define an electrically active state when it reaches a temperature above a maximum safe operating temperature of the compressed gas storage system. The electrically active state of the battery is characterized by the generation of sufficient electrical current to open the relief valve which permits gas to escape from the tank. In another embodiment, a thermocouple in combination with a conducting metal may be substituted for the battery.

Passive pressure relief device system based on thermobattery for a compressed gas storage tank

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Dreieich, Germany

Christian Koenig