Power generation system having fuel cell modules

• US 20030180603A1
• Filed: 03/24/2003
• Published: 09/25/2003
• Est. Priority Date: 03/22/2002
• Status: Abandoned Application

• Current Assignee: William R. Richards
• Original Assignee: William R. Richards
• Inventors: Richards, William R.
• Application Number:
  US10/393,919
• Publication Number:
  US 20030180603A1
• Time in Patent Office: Days
• US Class Current: 429/38
• CPC Class Codes: H01M 2008/1095 Fuel cells with polymeric electrolytes
• CPC Class Codes: H01M 8/026 characterised by grooves, e.g. their pitch or depth
• CPC Class Codes: H01M 8/0263 having meandering or serpentine paths
• CPC Class Codes: H01M 8/04089 of gaseous reactants
• CPC Class Codes: H01M 8/241 with solid or matrix-supported electrolytes
• CPC Class Codes: H01M 8/2457 with both reactants being gaseous or vaporised
• CPC Class Codes: H01M 8/2483 characterised by internal manifolds
• CPC Class Codes: H01M 8/2485 Arrangements for sealing external manifolds; Arrangements for mounting external manifolds around a stack
• CPC Class Codes: H01M 8/249 comprising two or more groupings of fuel cells, e.g. modular assemblies
• CPC Class Codes: Y02E 60/50 Fuel cells

Abstract

A power generation system of fuel cells has modular fuel cell assemblies (modules) that are connected together in series. The modules each have independent ports for fuel and air connections. The fuel and air ports are connected to manifolds. A manifold on one module is connected to the manifold of an adjacent module using a low compression face seal at the connection. The manifolds have shape factors that provide controlled gas flow to enable Stoichiometric process uniformity among the respective series connected modules. Each module operates to generate power individually and the power connections for each module are also connected in series so that as more modules are connected together in series, the power generated by the system increases.

Claims

1. A fuel cell power generation system, comprising:

series connectable modular assemblies, each of said modular assemblies including a power generation module having end plates and at least three cells between said end plates;

each of said modules having ports in said end plates and internal passages connected to the ports for low velocity gas flow in supply and return passages providing uniform supply of fuel and reactant gases to said cells with resultant Stoichiometric process uniformity of the gases occurring over the electro-chemically active regions within each said cell for each of said modules;

first and second, non-conductive manifolds connected to said ports in said end plates of said module for effecting low velocity gas distribution between adjacent ones of said modules connected in a series array,

said first and second external, non-conductive manifolds each having an inline inlet and outlet port at opposite ends capable of being sealed by use of a low-compression face-seal thereby allowing for end to end connectivity and sealing of gas supply and return passages from module to module, said outlet port also accommodating installation of a port plug when said outlet port is in a terminal one of said first and second manifolds at one end of a series connected array of said modules; and

said of said end plates having said ports for double-ended supply and/or return to each of said modules through said first and second manifolds.

2. A fuel cell power generation system according to claim 1, wherein said first and second external, non-conductive manifolds are fabricated identical in length to that of the respective individual power generation module height, as determined by the distance between a top face of an upper one of said end plates to a bottom face of a lower one of said end plates, with alignment and mechanical coupling of modules in series thereby effecting a resultant compression and subsequent sealing of said end to end connections between said manifolds.

3. A fuel cell power generation system according to claim 1, wherein said first and second external, nonconductive manifolds deliver the fuel and reactant gasses with low pressure drop, at initial supply pressures at or below 5 Psig to 1.5 Psig.

4. A fuel cell power generation system according to claim 1, wherein said first and second external, non-conductive manifolds have internal passages having a same dimension and shape in cross section as said internal passages and said passages of said end plates.

5. A fuel cell power generation system according to claim 1, wherein said internal passages and of said passages of said first and second external, non-conductive manifolds have a generally rectangular cross sectional shape that has a length to width dimension form 4 to 1 to 10 to 1 to deliver the fuel and reactant gasses with low pressure drop

6. A fuel cell power generation system according to claim 5, wherein said internal passages and said passages of said manifolds have a cross sectional shape that includes rounded end portions that are approximately semicircular and have a diameter that is equal to the width dimension.

7. A fuel cell modular assemblies, comprising:

opposed end plates and at least three cells between said end plates;

ports in said end plates and internal passages connected to the ports for low velocity gas flow in supply and return passages providing uniform supply of fuel and reactant gases to said cells with resultant Stoichiometric process uniformity of the gases occurring over the electro-chemically active regions within each said cell;

first and second, non-conductive manifolds connected to said ports in said end plates for effecting low velocity gas distribution, said manifolds having passages that have a same cross sectional shape and dimension as said internal passages of said cells;

said non-conductive manifolds each having an inline inlet and outlet port at opposite ends capable of being sealed by use of a low-compression face-seal thereby allowing for end to end connectivity and sealing of gas supply and return passages between adjacent manifolds that are connected together to form a series array of modules, said outlet port also accommodating installation of a port plug when said outlet port is in a terminal one of said manifolds at one end of a series connected array of said modules; and

said of said end plates having said ports for double-ended supply and/or return to each of said modules through said first and second manifolds.

8. A fuel cell power generation system according to claim 7, wherein said first and second external, non-conductive manifolds are fabricated identical in length to that of the respective individual power generation module height, as determined by the distance between a top face of an upper one of said end plates to a bottom face of a lower one of said end plates, with alignment and mechanical coupling of modules in series thereby effecting a resultant compression and subsequent sealing of said end to end connections between said manifolds.

9. A fuel cell power generation system according to claim 7, wherein said internal passages and said passages of said first and second external, non-conductive manifolds have a generally rectangular cross sectional shape that has a length to width dimension form 4 to 1 to 10 to 1 to deliver the fuel and reactant gasses with low pressure drop

10. A fuel cell power generation system according to claim 9, wherein rectangular cross sectional shape has rounded end portions that are approximately semicircular and have a diameter that is equal to the width dimension.