Method for manufacturing membrane electrode assembly
AssigneeAisin Seiki Kabushiki Kaisha
InventorGang Xie
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Abstract
A method for manufacturing a membrane electrode assembly comprises a process for preparing a electrolyte membrane and two gas diffusion layers, and a bonding process for forming the membrane electrode assembly by pressing a layered unit in which the electrolyte membrane is sandwiched between each of the two gas diffusion layers in such a way that provided catalyst layers locate in the interfaces between the electrolyte membrane and the two gas diffusion layers, wherein the bonding process is undertaken in a condition in which the surfaces of the electrolyte membrane are temporarily liquefied or softened.
Claims2
A method for manufacturing a membrane electrode assembly, comprising:
- a process for preparing a electrolyte membrane and two gas diffusion layers, and
- a bonding process for forming the membrane electrode assembly by pressing a layered unit in which the electrolyte membrane is sandwiched between the two gas diffusion layers in such a way that catalyst layers are located in the interfaces between the electrolyte membrane and the two gas diffusion layers,
- wherein the bonding process is undertaken in a condition in which surfaces of the electrolyte membrane are temporarily liquefied or softened,
- wherein the bonding process is undertaken while the surfaces of the electrolyte membrane are temporarily liquefied or softened by use of a modifying substance,
- wherein the modifying substance is applied in a first amount to a first portion of surfaces of the electrolyte membrane that are in contact with a gas diffusion layer, and the modifying substance is either not applied, or applied in second amount less than the first amount to a second portion of the surfaces of the electrolyte membrane that are in contact with a gas diffusion layer, and
- wherein said second portion is adjacent to a corner of one of the gas diffusion layers.
A method for manufacturing a membrane electrode assembly, comprising:
- a process for preparing a electrolyte membrane and two gas diffusion layers, and
- a bonding process for forming the membrane electrode assembly by pressing a layered unit in which the electrolyte membrane is sandwiched between the two gas diffusion layers in such a way that catalyst layers are located in the interfaces between the electrolyte membrane and the two gas diffusion layers,
- wherein the bonding process is undertaken in a condition in which surfaces of the electrolyte membrane are temporarily liquefied or softened,
- wherein a first portion of surfaces of the electrolyte membrane that are in contact with a gas diffusion layer is liqiuefied or softened, and a second portion of surfaces of the electrolyte membrane that are in contact with a gas diffusion layer is not liquefied or softened at all, or only liquefied or softened to a lesser amount than the first portion, and
- wherein said second portion of the surfaces of the electrolyte membrane is adjacent to a corner of one of the gas diffusion layers.
Dependencies are inferred from the claim text.