Fault tolerant bipolar gas electrode design for a rechargeable b

Details Fault tolerant bipolar gas electrode design for a rechargeable b Fault tolerant bipolar gas electrode design for a rechargeable b

1997-03-03

1998-10-13

Kalafut, Stephen

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Plural cells

429210, H01M 648

Patent

active

058210091

ABSTRACT:
A bipolar rechargeable battery comprises a vessel with an insulated liner and an interior region for bulk storage of a gas which serves as an electrode active material. A plurality of cells are nested within the vessel, each including a metallic bipolar cup having a circular base and an integral insulated hydrophobic upstanding side wall of truncated conical shape diverging with increased distance from the base. A solid phase positive electrode overlies the base. A dielectric separator separates the positive electrode and a gas phase negative electrode is configured to permit passage of electrolyte between the bipolar base of its cell and the base of an adjoining cell. The upstanding side wall of each cell is oriented to enable gas passage from each of said cells to the bulk gas storage region. The upstanding side walls of the adjacent cells mutually define a gap enabling gas communication between the adjacent cells and between each of the cells and the bulk gas storage region. In one embodiment, there is no gas screen between the negative electrode and the bipolar base of an adjoining cell. In another embodiment, a gas screen is provided having a fine porosity but of larger porosity than that of the separator.

REFERENCES:
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patent: 5354630 (1994-10-01), Earl et al.
patent: 5395706 (1995-03-01), Hall
patent: 5395708 (1995-03-01), Hall
patent: 5578394 (1996-11-01), Oweis et al.
patent: 5652073 (1997-07-01), Lenhart et al.

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