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Assignee: Plug Power Inc.


Location: Latham, NY
No. of patents: 117

1      
NumberTitleIssue Date
7951498Method and apparatus for controlling an integrated fuel cell system
A control algorithm for operating an integrated fuel cell system includes the following steps: determining whether a power output of a fuel cell is within a first predetermined range of an electrical load coupled to the fuel cell; lowering a reactant flow to the fue...
05/31/2011
7915854Maximizing energy storage life in a fuel cell system using active temperature compensation
A fuel cell system includes a fuel cell stack, energy storage and a control subsystem. The energy storage supplements a power that is provided by the fuel cell stack. The energy storage is coupled to the fuel cell stack and has a voltage. The control system regulate...
03/29/2011
7892689Pressure relief control system for a fuel cell system having a pressurized fuel flow
A fuel cell-based system includes an electromechanical pressure relief system to prevent an overpressure condition from damaging the anode circuit of a fuel cell stack or creating a hazardous environment. Upon detection of a fuel flow pressure in a fuel path between...
02/22/2011
7862947Fault management in a fuel cell-based system
A system includes a fuel cell stack, a power communication path, a first controller and a second controller. The fuel cell stack generates electrical power, and the power communication path is coupled between the fuel cell stack and a load of the system to communica...
01/04/2011
7851096Humidifying a reactant flow of a fuel cell system
A technique that is usable with a fuel cell includes generating a humidified reactant flow. The technique includes measuring a rate of condensate production from the reactant flow and controlling the generation of the humidified reactant flow in response to the meas...
12/14/2010
7691507Combination fuel cell and ion pump, and methods and infrastructure systems employing same
A combination fuel cell and hydrogen or oxygen pump includes an electrochemical cell comprising an anode inlet for receiving fuel, an anode outlet for exhausting fuel, a cathode inlet for receiving oxidant, a cathode outlet for exhausting oxidant, and first and seco...
04/06/2010
7521146Switching modes of operation of a fuel cell
A technique that is usable with a fuel cell stack includes routing an anode exhaust of the fuel cell stack to an anode exhaust line. Based on a mode operation of the fuel cell stack, communication is selectively established between a cathode chamber of the fuel cell...
04/21/2009
7514165Fuel cell system fluid recovery
A system and method are provided for fluid collection within a fuel cell system. The fluid collection device includes a fluid collection container which has a gas inlet, a gas outlet, at least one fluid inlet, and a fluid outlet. The at least one fluid inlet allows ...
04/07/2009
7479335Anode humidification
A technique includes providing fuel and oxidant flows to a fuel cell. The technique includes humidifying the anode of the fuel cell, including saturating the oxidant flow and maintaining a temperature of the oxidant flow above a temperature of the fuel cell such tha...
01/20/2009
7470294Fuel processor design and method of manufacture
The invention generally relates to a fuel processor design and a method for manufacture. In one aspect of the invention, a fuel processor assembly has a first plate and a second plate that are mated to form a plurality of reactor housings and channels to direct the ...
12/30/2008
7449258Integrated fuel cell stack thermostat
A fuel cell system includes a fuel cell stack and a thermostat. The thermostat is mounted to the fuel cell stack to regulate a flow of coolant. ...
11/11/2008
7416800Method and apparatus for a combined fuel cell and hydrogen purification system
Fuel cell systems and associated methods of operation are provided whereby application of a fuel cell is coordinated with a fuel processor and a hydrogen separator. One such method includes the following steps: (1) operating a fuel processor to convert a hydrocarbon...
08/26/2008
7416799Oxidizer for a fuel cell system
An oxidizer that is usable with a fuel cell includes a catalyst, an inlet to communicate an oxidant flow, an injection tube to communicate an anode exhaust flow, a mixing tube and a divergent nozzle. The injection tube communicates the anode exhaust flow from the fu...
08/26/2008
7410931Thermal regulating catalyst composition
A composition is provided that can be used, for example, in a fuel processor for a fuel cell system. The composition includes a first material such as a catalyst, and a second material such as a desiccant. The second material is capable of sorbing and desorbing a he...
08/12/2008
7396611Fuel cell catalyst layer
Fuel cell catalyst layers, and related systems and methods are disclosed. ...
07/08/2008
7332236Method and apparatus for controlling a combined heat and power fuel cell system
A cogeneration fuel cell system and associated methods of operation are provided that accommodate a demand for heat as well as a demand for electric power. The system is operated among various modes to balance heat and power demand signals. In general, a fuel cell s...
02/19/2008
7326481Fuel cell system
The invention provides a reactant delivery system for a dead-headed PEM fuel cell system, comprising a fuel cell, a fuel supply, a purge valve, an inlet orifice, an outlet orifice, and a controller. A first fuel flow circuit is provided, wherein fuel is flowed from ...
02/05/2008
7285346Method and apparatus for controlling a combined heat and power fuel cell system
A cogeneration fuel cell system and associated methods of operation are provided that accommodate a demand for heat as well as a demand for electric power. The system is operated among various modes to balance heat and power demand signals. In general, a fuel cell s...
10/23/2007
7276307Method and apparatus for controlling a combined heat and power fuel cell system
A cogeneration fuel cell system and associated methods of operation are provided that accommodate a demand for heat as well as a demand for electric power. The system is operated among various modes to balance heat and power demand signals. In general, a fuel cell s...
10/02/2007
7264895Fuel cell thermal management system
The invention provides fuel cell systems and methods of operation where a fuel cell system is used as a backup power supply in a cold environment where the system must be maintained at a suitable temperature to allow the fuel cell to operate when needed. In one embo...
09/04/2007
7252900Combination fuel cell and ion pump, and methods and infrastructure systems employing same
A combination fuel cell and hydrogen or oxygen pump includes an electrochemical cell comprising an anode inlet for receiving fuel, an anode outlet for exhausting fuel, a cathode inlet for receiving oxidant, a cathode outlet for exhausting oxidant, and first and seco...
08/07/2007
7223488Integrated fuel cell system
A simplified PEM fuel cell system is integrated with a fuel processor and an exhaust gas oxidizer to ensure clean emissions. The fuel cell has an operating temperature of 100–200° C., and utilizes reformate fuel having a carbon monoxide level greater than 1000 pa...
05/29/2007
7222001System for monitoring and controlling fuel cell-based power generation units
A system includes fuel cell units and an on-site computer that is located near the units. The on-site computer is coupled to the fuel cell subsystems to communicate indications of operating conditions of the fuel cell subsystems over a remote communication link to a...
05/22/2007
7179554Fuel cell systems
A method of operating a fuel cell system having a fuel cell stack and a plurality of fuel cells associated with the fuel cell stack. The method includes monitoring an operating parameter associated with the fuel cell stack, and adjusting a temperature of the fuel ce...
02/20/2007
7166378Technique to regulate an efficiency of a fuel cell system
A technique that is usable with a fuel cell stack includes providing a fuel flow to the stack, changing the fuel flow and observing a response of at least one cell voltage of the stack to the change in the fuel flow. An efficiency of the stack is regulated based on ...
01/23/2007
7166379Technique to regulate an efficiency of a fuel cell system
A technique that is usable with a fuel cell stack includes providing a fuel flow to the stack, changing the fuel flow and observing a response of at least one cell voltage of the stack to the change in the fuel flow. An efficiency of the stack is regulated based on ...
01/23/2007
7141323Method and apparatus for electrochemical compression and expansion of hydrogen in a fuel cell system
The invention relates to fuel cell systems and associated methods of operation where an electrochemical cell such as a fuel cell is used as an electrochemical hydrogen separator to separate hydrogen from a process stream (e.g., reformate or synthesis gas), or as an ...
11/28/2006
7132182Method and apparatus for electrochemical compression and expansion of hydrogen in a fuel cell system
The invention relates to fuel cell systems and associated methods of operation where an electrochemical cell such as a fuel cell is used as an electrochemical hydrogen separator to separate hydrogen from a process stream (e.g., reformate or synthesis gas), or as an ...
11/07/2006
7122258Fuel cell air system and method
The invention provides filtration systems and associated methods for filtering a fuel cell reactant stream of particulate and vapor contaminants. In one embodiment, the invention provides a reactant filtration system for a fuel cell, including a first filter having ...
10/17/2006
7112378Apparatus and method for dynamic control of an enthalpy wheel in a fuel cell system
The invention relates to systems and associated methods of operating fuel cell systems where the rotational speed of a reactant humidification enthalpy wheel is dynamically controlled according to various process variables. In one embodiment, a method is provided fo...
09/26/2006
7099787Technique and apparatus to measure a fuel cell parameter
A technique includes introducing an electrical perturbation to a fuel cell system during operation of the fuel cell system. This electrical perturbation does not substantially disrupt the operation of the fuel cell system. In response to the perturbation, an electri...
08/29/2006
7090943Regulating the communication of power to components of a fuel cell system
A technique includes providing power to a group fuel cell system components and providing sensors to monitor conditions of the fuel cell system. The status of each sensor is associated with a switch, and the switches are serially coupled together. The delivery of po...
08/15/2006
7090939Forming a layer on a flow plate of a fuel cell stack
A technique includes applying a charge to a flow plate of a fuel cell stack and depositing a material on at least a portion of the flow plate in response to the charge. In some embodiments of the invention, the technique may be applied to a fuel cell stack that incl...
08/15/2006
7045233Method and apparatus for electrochemical compression and expansion of hydrogen in a fuel cell system
The invention relates to fuel cell systems and associated methods of operation where an electrochemical cell such as a fuel cell is used as an electrochemical hydrogen separator to separate hydrogen from a process stream (e.g., reformate or synthesis gas), or as an ...
05/16/2006
7041411Method and apparatus for collecting condensate from combustible gas streams in an integrated fuel cell system
The invention generally relates to a method and apparatus for collecting condensate from combustible gas process streams in an integrated fuel cell system. In one aspect, a water management subsystem for a fuel cell system has a first conduit containing a first gas ...
05/09/2006
7033688Apparatus and method for controlling a fuel cell system
The invention provides integrated fuel cell systems and associated operating methods wherein oxidant flow is controlled in response to an oxygen sensor in an exhaust stream of a fuel cell exhaust gas oxidizer, and fuel flow is controlled in response to a temperature...
04/25/2006
7029784Nested fuel cell field plate
The invention provides a layered design for a fuel cell flow field plate. A flow field plate is formed by mating at least two interlocking layers that form an internal fluid channel between them. The internal fluid channel is generally used to circulate a coolant th...
04/18/2006
7026065Fuel cell system heat recovery
The invention provides a fuel cell incorporating a thermal management scheme and associated methods of operation. In one aspect, a fuel cell system includes a frame enclosing a fuel cell, a coolant flow circuit and a heat exchanger. The frame has at least one extern...
04/11/2006
7014937Architected fuel cell system for modular application
The invention provides apparatuses and associated methods of manufacture for fuel cell systems designed for modular application. In one embodiment, a fuel cell system is provided that has a base module assembly. The base module assembly includes a first frame member...
03/21/2006
7011903Method and apparatus for a combined fuel cell and hydrogen purification system
Fuel cell systems and associated methods of operation are provided whereby application of a fuel cell is coordinated with a fuel processor and a hydrogen separator. One such method includes the following steps: (1) operating a fuel processor to convert a hydrocarbon...
03/14/2006
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