Bipolar electrochemical battery of stacked wafer cells

H - Electricity – 01 – M

Patent

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Details

H01M 10/04 (2006.01) H01M 4/24 (2006.01) H01M 10/34 (2006.01) H01M 4/02 (2006.01) H01M 4/36 (2006.01) H01M 4/38 (2006.01) H01M 4/54 (2006.01) H01M 4/62 (2006.01) H01M 4/80 (2006.01) H01M 10/24 (2006.01) H01M 10/52 (2006.01) H01M 4/48 (2006.01) H01M 4/50 (2006.01) H01M 4/52 (2006.01)

Patent

CA 2173330

The subject invention relates to electrode structures that are adaptable for primary and electrically rechargeable electrochemical wafer cells. A flat wafer cell is disclosed that includes conductive, carbon-filled polymeric outer layers that serve as electrode contacts and as a means of containment of the cell. Multi-cell, higher voltage batteries may be constructed by stacking individual cells. Specially formulated electrodes and processing techniques that are compatible with the wafer cell construction are disclosed for a nickel-metal hydride battery system. This invention is further directed to fabrication of electrodes from electrochemically active material prepared by coating non- to low-conductive particles of a metal hydroxide or metal oxide powder with nickel using a electroless nickel coating process. The cell design and electrode formulations provide for individual operation of a vented or low pressure sealed cell and/or for operation of these cells in a stacked array in an outer battery housing.

La présente invention a pour objet des structures d'électrodes qui peuvent être adaptées pour des éléments à plaques électrochimiques primaires et électriquement rechargeables. Un élément à plaques plates se compose de couches externes polymères, remplies de carbone et conductrices, qui servent de contacts d'électrodes et de conteneur de l'élément. Il est possible de construire des accumulateurs à plusieurs éléments, présentant une tension supérieure, en empilant des éléments individuels. Des électrodes spécialement formulées et des techniques de traitement compatibles avec la construction de l'élément à plaques sont décrites pour un système d'accumulateur hybride nickel-métal. L'invention concerne, en outre, la fabrication d'électrodes à partir d'un matériau électrochimiquement actif, obtenu en recouvrant de nickel des particules peu ou non conductrices d'hydroxyde de métal ou de poudre d'oxyde de métal, selon un procédé de nickelage sans courant. La conception de l'élément et les formulations des électrodes assurent le fonctionnement individuel d'un élément scellé de manière étanche, à faible pression ou dégazé et/ou le fonctionnement de ces éléments dans un ensemble empilé dans un logement extérieur d'accumulateurs.

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