Fuel cell units having angled offset flow channels

Abstract

The present disclosure provides fuel cell units formed from a plurality of flow plate assemblies disposed in a stack configuration, with adjacent flow plate assemblies in the stack configuration disposed at an offset angle relative to each other. Fuel cell stacks can be formed from a plurality of the fuel cell units placed into a stack aligned with each other with no offset. The present disclosure also provides for methods of forming the fuel cell units, fuel cell stacks, and fuel cell systems containing the former.

What is claimed: 
     
         1 . A fuel cell system comprising:
 a plurality of flow plate assemblies disposed in a stack configuration;   wherein each flow plate assembly comprises an identical flow plate ( 300 ) and a membrane electrode assembly ( 400 / 401 / 402 );   wherein each flow plate ( 300 ) comprises a corrugated plate having cathode fluid flow channels ( 330 ) on a first face of the corrugated plate and anode fluid flow channels ( 315 ) across a second face of the corrugated plate,   wherein the cathode fluid flow channels ( 330 ) and anode fluid flow channels ( 315 ) are arranged to provide fluid flow from a flow plate inlet region ( 310 ) to a flow plate outlet region ( 320 ), and the flow plate further comprises one or more pairs of side seal regions ( 305 );   wherein each membrane electrode assembly ( 400 / 401 / 402 ) is disposed on the first face of the corrugated plate;   wherein each flow plate assembly further comprises a fluid manifold periphery plate ( 200 / 800 ) having an inlet manifold portion ( 205 ) configured to engage with the flow plate inlet region ( 310 ), an outlet manifold portion ( 210 ) configured to engage with the flow plate outlet region ( 320 ), and one or more pairs of pass-through manifold portions ( 215 ) configured to engage with the one or more pairs of side seal regions ( 305 ); and   wherein adjacent cross-flowed channels in adjacent plates reduces deformation of the membrane electrode assembly   
     
     
         2 . The fuel cell unit of  claim 1 , wherein each flow plate assembly further comprises an inter-cell sealing element ( 801 ) disposed on a first surface of the fluid manifold periphery plate ( 200 / 800 ). 
     
     
         3 . The fuel cell unit of  claim 2 , wherein the inter-cell sealing element ( 801 ) of each flow plate assembly is retained within a sealing retention feature ( 802 ) of the fluid manifold periphery plate ( 200 / 800 ). 
     
     
         4 . The fuel cell unit of  claim 1 , wherein:
 each flow plate comprises a square flow field and has one pair of side seal regions ( 305 );   each fluid manifold periphery plate ( 200 / 800 ) has one pair of pass-through manifold portions ( 215 );   the offset angle is 90°; and   the fuel cell unit has two flow plate assemblies disposed in a stack configuration.   
     
     
         5 . The fuel cell unit of  claim 1 , wherein:
 each flow plate comprises a hexagonal flow field and has two pairs of side seal regions ( 305 );   each fluid manifold periphery plate ( 200 / 800 ) has two pairs of pass-through manifold portions ( 215 );   the offset angle is 60°; and   the fuel cell unit has three flow plate assemblies disposed in a stack configuration.   
     
     
         6 . The fuel cell unit of  claim 1 , wherein:
 each flow plate comprises an octagonal flow field and has three pairs of side seal regions ( 305 );   each fluid manifold periphery plate ( 200 / 800 ) has three pairs of pass-through manifold portions ( 215 );   the offset angle is 45°; and   the fuel cell unit has four flow plate assemblies disposed in a stack configuration.   
     
     
         7 . The fuel cell unit of  claim 1 , wherein:
 each flow plate comprises a decagonal flow field and has four pairs of side seal regions ( 305 );   each fluid manifold periphery plate ( 200 / 800 ) has four pairs of pass-through manifold portions ( 215 );   the offset angle is 36°; and   the fuel cell unit has five flow plate assemblies disposed in a stack configuration.   
     
     
         8 . The fuel cell unit of  claim 1 , wherein:
 the inlet manifold portion ( 205 ) of each fluid manifold periphery plate ( 200 / 800 ) comprises a plurality of anode inlets ( 810 ), a plurality of cathode inlets ( 820 ), and a coolant inlet ( 830 );   the outlet manifold portion ( 210 ) of each fluid manifold periphery plate ( 200 / 800 ) comprises a plurality of anode outlets ( 811 ) and a plurality of cathode outlets ( 821 ); the plurality of anode inlets ( 810 ), the coolant inlet ( 830 ), and the plurality of anode outlets ( 811 ) are fluidly connected to the anode flow channels ( 315 ) of an associated flow plate ( 300 ); and   the plurality of cathode inlets ( 820 ) and the plurality of cathode outlets ( 821 ) are fluidly connected to the cathode flow channels ( 330 ) of an associated flow plate ( 300 ).   
     
     
         9 . A fuel cell stack comprising:
 a plurality of identical fuel cell units, the plurality of fuel cell unit of  claim 1 , with each identical fuel cell unit aligned with an adjacent fuel cell unit with no offset angle.   
     
     
         10 . A fuel cell system comprising the fuel cell stack of  claim 9 . 
     
     
         11 . The fuel cell system of  claim 9 , further comprising:
 an anode fluid supply containing anode fluid and fluidly connected to the anode inlets ( 810 ) of the fuel cell stack;   a cathode fluid supply containing cathode fluid and fluidly connected to the cathode inlets ( 820 ) of the fuel cell stack; and   a coolant fluid supply containing coolant fluid and fluidly connected to the coolant inlets ( 830 ) of the fuel cell stack.   
     
     
         12 . The fuel cell system of  claim 11 , wherein:
 the anode fluid comprises a fuel;   the cathode fluid comprises an oxidant; and   the coolant fluid comprises water.   
     
     
         13 . The fuel cell system of  claim 12 , wherein:
 the fuel comprises hydrogen gas; and   the oxidant comprises oxygen gas.   
     
     
         14 . A method of even compression in a fuel cell, the method comprising:
 forming a plurality of identical flow plates ( 300 ) each comprising a corrugated plate having cathode fluid flow channels ( 330 ) on a first face of the corrugated plate and anode fluid flow channels ( 315 ) across a second face of the corrugated plate;   wherein the cathode fluid flow channels ( 330 ) and anode fluid flow channels ( 315 ) are arranged to provide fluid flow from a flow plate inlet region ( 310 ) to a flow plate outlet region ( 320 ), and the flow plate further comprises one or more pairs of side seal regions ( 305 );   forming a plurality of fluid manifold periphery plates ( 200 / 800 );   wherein each fluid manifold periphery plate ( 200 / 800 ) comprises an inlet manifold portion ( 205 ) configured to engage with the flow plate inlet region ( 310 ), an outlet manifold portion ( 210 ) configured to engage with the flow plate outlet region ( 320 ), and one or more pairs of pass-through manifold portions ( 215 ) configured to engage with the one or more pairs of side seal regions ( 305 );   forming a plurality of flow plate assemblies, each flow plate assembly comprising one of the identical flow plates disposed on one of the fluid manifold periphery plates and a membrane electrode assembly ( 400 / 401 / 402 ) disposed on the first face of the corrugated plate;   wherein the forming of each flow plate assembly comprises engaging the inlet manifold portion ( 205 ) with the flow plate inlet region ( 310 ), engaging the outlet manifold portion ( 210 ) with the flow plate outlet region ( 320 ), and engaging the one or more pairs of pass-through manifold portions ( 215 ) with the one or more pairs of side seal regions ( 305 ); and   forming the fuel cell unit by assembling a plurality of the formed flow plate assemblies into a stack configuration with adjacent flow plate assemblies disposed at a 90 degree offset angle to place the channels in adjacent plates across one another.   
     
     
         15 . The method of forming a fuel cell unit of  claim 14 , wherein the forming of each flow plate assembly further comprises disposing an inter-cell sealing element ( 801 ) on a first surface of the fluid manifold periphery plate ( 200 / 800 ). 
     
     
         16 . The method of forming a fuel cell unit of  claim 15 , wherein the forming of each flow plate assembly further comprises retaining the inter-cell sealing element ( 801 ) of each flow plate assembly within a sealing retention feature ( 802 ) formed in the fluid manifold periphery plate ( 200 / 800 ).