End pressure plate for electrolysers

1. An end pressure plate for at least one of an electrolyser stack and an electrolyser module comprising a load transfer plate for maintaining even pressure over the faces of a plurality of structural plates, and a backing plate for supporting load transferred from said load transfer plate;

wherein:

one face of said load transfer plate is flat and is in contact with an opposing face of the adjacent one of said plurality of structural plates; and

the opposite face of said load transfer plate includes a domed surface in contact with an opposing face of said backing plate.

2. An end pressure plate as claimed in claim 1 where said end pressure plate is comprised of at least one of metal, plated metal, and coated metal.

3. An electrolyser module comprising a plurality of structural plates each having a sidewall extending between opposite end faces with a half cell chamber opening and at least two degassing chamber openings extending through said structural plate between said opposite end faces;

said structural plates being arranged in face to face juxtaposition between opposite end pressure plates;

each said half cell chamber opening at least partially housing electrolytic half cell components comprising at least an electrode, a bipolar plate in electrical communication with said electrode, and a membrane communicating with said electrode for providing ionic conduction, said structural plates and half cell components defining an array of series connected electrolytic cells surmounted by at least one degassing chamber; and

said structural plates defining, at least when in face-to-face juxtaposition, passages for fluid flow inside said electrolyser module;

wherein:

said end pressure plates comprise a load transfer plate in contact with an adjacent of said structural plates for maintaining even pressure over the faces of said structural plates, and a backing plate in contact with said load transfer plate for supporting load transferred from said load transfer plate;

one face of said load transfer plate is flat and is in contact with the opposing face of the adjacent of said plurality of structural plates; and

the opposite face of said load transfer plate includes a domed surface in contact with the opposing face of said backing plate.

4. The electrolyser module of claim 3 wherein said electrolyser module comprises an alkaline water electrolyser module or a PEM electrolyser module.

5. An electrolyser stack comprising a plurality of structural plates each having a sidewall extending between opposite end faces with a half cell chamber opening, at least two header flow passage openings and at least one footer flow passage opening extending through said structural plate between said opposite end faces;

said structural plates being arranged in face to face juxtaposition between opposite end pressure plates;

each said half cell chamber opening at least partially housing electrolytic half cell components comprising at least an electrode, a bipolar plate in electrical communication with said electrode, and a membrane communicating with said electrode for providing ionic conduction, said structural plates and half cell components defining an array of series connected electrolytic cells; and

said structural plates defining, at least when in face-to-face juxtaposition, passages for fluid flow inside said electrolyser module;

wherein:

said end pressure plates comprise a load transfer plate in contact with an adjacent of said structural plates for maintaining even pressure over the faces of said structural plates, and a backing plate in contact with said load transfer plate for supporting load transferred from said load transfer plate;

one face of said load transfer plate is flat and is in contact with an opposing face of an adjacent one of said plurality of structural plates; and

the opposite face of said load transfer plate includes a domed shape in contact with the opposing face of said backing plate.

6. The electrolyser stack of claim 5 wherein said electrolyser stack comprises an alkaline water electrolyser stack or a PEM electrolyser stack.

7. The electrolyser stack of claim 5 wherein said electrolyser stack comprises a PEM water electrolyser stack or a PEM electrolyser stack.