US Pat. No. 9,368,814

SYSTEM AND METHOD FOR CONTROLLING FUEL CELL MODULE

Hydrogenics Corporation, ...

2. A fuel cell module comprising,
a) a hydrogen recirculation pump; and,
b) a controller,
wherein,
c) the controller receives a signal indicating the electrical current drawn by the hydrogen recirculation pump; and,
d) the controller is programmed to consider the signal in controlling one or more balance of plant elements that effect the
removal of water from the stack.

US Pat. No. 9,580,825

ELECTROLYZER CELL STACK SYSTEM

Hydrogenics Corporation, ...

1. A balance-of-plant system, suited for regulating the operation of an electrolyzer cell stack having at least one electrolyzer
cell having a first output port for a first reaction product and a second output port for a second reaction product, at least
one of the first and second output ports being for supply of one of the reaction products as a gas for use, the balance-of-plant
system comprising:
a first pressure regulator for regulating a first pressure of the first reaction product;
a pressure following device for regulating a second pressure of the second reaction product relative to the first pressure,
the pressure following device consisting essentially of a pressure actuated valve connected to the second output port,

wherein the second pressure follows, and is changed only in response to, changes in the first pressure.
US Pat. No. 9,929,413

FUEL CELL SUB-ASSEMBLY AND METHOD OF MAKING IT

Hydrogenics Corporation, ...

1. A sub-assembly for an electrochemical stack comprising,a) a bipolar plate having upper and lower faces and an edge between the upper and lower faces, the upper and lower faces both containing flow fields; and,
b) sealing material bonded to the bipolar plate and extending from the upper face of the bipolar plate, around the edge of the bipolar plate, and onto the lower face of the plate,
wherein the bipolar plate comprises an anode plate and a cathode plate bonded together by the sealing material, and a coolant flow field between the anode plate and the cathode plate;
wherein the sealing material further extends between the anode plate and the cathode plate to form a seal around the coolant flow field; and
wherein one or both of the anode and cathode plates have a peripheral step extending inwards from the edge in the inner face of the plate, a peripheral key extending inwards from the edge in the inner face of the plate, or a gate extending inwards from the edge along an inner face of the plate to a groove in the inner face of at least one of the anode and cathode plates, the step, key or gate and groove filled with sealing material.

US Pat. No. 10,084,196

SYSTEM AND METHOD FOR CONTROLLING FUEL CELL MODULE

Hydrogenics Corporation, ...

1. A process for operating a fuel cell stack comprising the steps of,a) re-circulating hydrogen through the stack using a pump;
b) monitoring a parameter responsive to the energy consumed by the pump per unit volumetric flow rate of re-circulating hydrogen; and,
c) increasing a rate of water removal from the stack if the parameter is above a preferred value or range and decreasing the rate of water removal from the stack if the parameter is below the selected value or range.

US Pat. No. 10,214,821

ELECTROLYSER AND ENERGY SYSTEM

HYDROGENICS CORPORATION, ...

1. A process comprising the steps of,a) providing an electrolyser, wherein the electrolyser comprises a plurality of discrete stack assemblies;
b) receiving a series of dispatches, each of the dispatches indicating a specified power consumption to be consumed over a specific period of time, the dispatches occurring at least once every 30 minutes;
c) operating a first subset of the discrete stack assemblies of the electrolyser at a variable rate of power consumption, and operating a second subset of the discrete stack assemblies of the electrolyser each at a continuous rate of power consumption, wherein the continuous rate of power consumption is full power or such that a minimum number of discrete stack assemblies provides the minimum specified power consumption expected over a plurality of dispatches, wherein the electrolyser consumes the specified power consumption over the period of time according to the dispatches; and,
d) discharging hydrogen produced during step c) to a natural gas system.

US Pat. No. 10,193,164

FLOW FIELDS FOR ELECTROCHEMICAL CELL

Hydrogenics Corporation, ...

1. A set of flow field plates for an electrochemical cell comprising,a first flow field plate having a flow field wherein 50% or more of the area of the flow field of the first flow field plate is defined by a plurality of elongate ridges, and
a second flow field plate having a flow field wherein 50% or more of the area of the flow field of the second flow filed plate is defined by a plurality of discontinuous lines of short ridges, wherein the short ridges are less than 10 times as long as an average gap between successive elongate ridges, the gap measured perpendicular to the elongate ridges.

US Pat. No. 10,181,610

FAST STARTING FUEL CELL

HYDROGENICS CORPORATION, ...

1. An electrical power supply system comprising,a) a fuel cell module;
b) a source of electrical power;
c) a diode; and,
d) an electrical circuit configured to selectively connect the fuel cell module in parallel with the source of electrical power either around or through the diode,
wherein the forward direction of the diode is from the fuel cell module towards the source of electrical power and the diode is in series with the fuel cell module; and
wherein the electrical circuit comprises a by-pass circuit around both of the diode and a start up contactor or other switch in series with the diode.

US Pat. No. 10,164,278

NITROGEN ENRICHED AIR GENERATION AND FUEL TANK INERTING SYSTEM

HYDROGENICS CORPORATION, ...

1. A fuel cell power module having a cathode side exhaust outlet connected (i) to a recirculation line connected to a cathode side inlet and (ii) to a fuel tank, baggage hold or other area requiring inerting or fire suppression and having a controller connected to at least one controllable device operable by the controller, wherein the controller is programmed to adjust the flow rate in the recirculation line so as to keep the oxygen or nitrogen concentration in the cathode side exhaust within a specified range, below a specified oxygen threshold or above a specified nitrogen threshold.
US Pat. No. 10,164,285

FUEL CELL SUB-ASSEMBLY AND METHOD OF MAKING IT

HYDROGENICS CORPORATION, ...

1. A method of making a sub-assembly comprising the steps of,a) loading a single anode plate and a single cathode plate into a mold such that reactant flow fields on the plates face away from each other, wherein an inner face of the anode plate and/or cathode plate comprises an elongated step or key open to an edge of the plate;
b) injecting a liquid sealing material, into the mold,
wherein the liquid sealing material fills a gap between the edge of the plates, including the step or key, and portions of the outer faces of the plates, and the mold.