JP2009117281A5

JP2009117281A5 -

Info

Publication number: JP2009117281A5
Application number: JP2007291719A
Authority: JP
Filing date: 2007-11-09
Publication date: 2010-12-16
Anticipated expiration: 2027-11-09

Claims

On both sides of the electrolyte membrane and a separator and a membrane electrode assembly in which a pair of electrodes, together with the reaction gas flow path for supplying a reactant gas along an electrode surface is formed, the separator, the A polymer electrolyte fuel cell in which an inlet buffer portion and an outlet buffer portion are provided on the upstream side and the downstream side of the reaction gas channel ,
A water absorption portion provided at least in the outlet buffer portion ;
A water outlet opening communicating with the water absorption part;
A water inlet communicating with the upstream side of the reaction gas flow path;
A water circulation channel that connects the water outlet and the water inlet and is disposed outside the reactive gas channel;
A pump that is disposed in the water circulation channel and returns the water collected by the water absorption part to the upstream side of the reaction gas channel;
A polymer electrolyte fuel cell comprising:

The separator has an electrolyte membrane / electrode structure provided with a pair of electrodes on both sides of the electrolyte membrane, and a reaction gas flow path for supplying a reaction gas along the electrode surface. A polymer electrolyte fuel cell in which an inlet buffer portion and an outlet buffer portion are provided on the upstream side and the downstream side of the reaction gas channel ,
A water absorbing portion provided on the same plane as the diffusion layer in at least a portion corresponding to the outlet buffer portion of the electrolyte membrane / electrode structure;
A water outlet opening communicating with the water absorption part;
A water inlet communicating with the upstream side of the reaction gas flow path;
A water circulation channel that connects the water outlet and the water inlet and is disposed outside the reactive gas channel;
A pump that is disposed in the water circulation channel and returns the water collected by the water absorption part to the upstream side of the reaction gas channel;
Polymer electrolyte fuel cell according to claim Rukoto to have a.

2. The polymer electrolyte fuel cell according to claim 1 , wherein a water supply unit is provided at least in the inlet buffer unit.

3. The polymer electrolyte fuel cell according to claim 2 , wherein the electrolyte membrane / electrode structure is provided with a water supply portion on the same plane as the diffusion layer at least in a portion corresponding to the inlet buffer portion. Solid polymer fuel cell.

The polymer electrolyte fuel cell according to any one of claims 1 to 4 , comprising a stack in which a plurality of the electrolyte membrane / electrode structures and the separator are laminated,
The polymer electrolyte fuel cell, wherein the stack is provided with the water outlet and the water inlet penetrating in the stacking direction.

6. The polymer electrolyte fuel cell according to claim 5 , wherein the water circulation channel and the pump are integrally provided in the stack.

In the solid polymer fuel cell according to any one of claims 1 to 6, wherein the pump is set at a lower suction pressure than water retaining force of the water absorbing portion provided on the downstream side of the reaction gas channel A polymer electrolyte fuel cell, characterized in that:

The polymer electrolyte fuel cell according to any one of claims 1 to 7 , wherein the water circulation passage is provided with a switching valve and a drain passage for discharging the water to the outside. Solid polymer fuel cell.

In the solid polymer fuel cell according to any one of claims 1-8, wherein the water circulation passage, characterized in that in the same pole connecting with the water inlet and the water outlet solid Polymer fuel cell.

In the solid polymer fuel cell according to any one of claims 1-8, wherein the water circulation passage, solid high, characterized by connecting the said water inlet and said water outlet in the different poles Molecular fuel cell.

The polymer electrolyte fuel cell according to any one of claims 1 to 10 , wherein the water absorbing portion is a hydrophilic water absorbing member.

The polymer electrolyte fuel cell according to any one of claims 3 to 11, wherein the water supply unit is a hydrophilic water-absorbing member.