Bipolar lithium-ion rechargeable battery

H - Electricity – 01 – M

Patent

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Details

H01M 4/02 (2006.01) H01M 4/04 (2006.01) H01M 10/04 (2006.01) H01M 10/26 (2006.01) H01M 6/48 (2006.01) H01M 10/36 (2006.01) H01M 10/40 (2006.01)

Patent

CA 2202508

A novel and improved rechargeable, lithium-ion battery system (10) is composed of a plurality of individual electrochemical cells (12a, 12b,...12n) having positive and negative electrodes (14a, 14b,...14n) (16a, 16b,...16n) disposed in opposite face-to-face arrangement with a porous separator (18a, 18b,...18n) containing electrolyte therebetween, and wherein the positive and negative electrodes of adjacent cells are disposed in contact respectively with opposite sides of a common current-collecting element (20a, 20b...20n) forming a unitary bipolar structure. The negative electrode comprises a layer of carbon (24) adhered to one side of the current-collecting element while the positive electrode comprises a layer containing a lithium transition metal oxide or sulfide compound (26) adhered to the other opposite side of the element. The unitary bipolar structures containing the positive and negative electrodes of adjacent cells include outer peripheral, electrically-insulating seal members, preferably in the form of plastic insulating rings (28a, 28b,...28n), which are joined together in a sealed stacked array.

La présente invention concerne un nouveau perfectionnement de dispositif d'accumulateur électrique (10) à ions lithium. Ce dispositif est composé d'une pluralité d'éléments électrochimiques distincts (12a, 12b, ... 12n) présentant des électrodes positives et négatives (14a, 14b, ... 14n), (16a, 16b, ... 16n) disposées en vis-à-vis, de part et d'autre d'un séparateur poreux (18a, 18b, ... 18n) contenant un électrolyte. Les électrodes positives et négatives de deux éléments consécutifs sont disposées en contact direct avec les faces opposées respectives d'un collecteur de courant commun (20a, 20b, ... 20n) de façon à constituer une structure bipolaire unitaire. L'électrode négative comporte une couche de carbone (24) adhérant à une face du collecteur de courant, l'électrode positive comportant une couche d'un composé (26) oxyde métallique ou sulfure de transition lithium adhérant à l'autre face du collecteur de courant. Les structures bipolaires unitaires renfermant les électrodes positives et négatives d'éléments consécutifs incluent des pièces d'isolation électrique, de préférence des anneaux d'isolation plastiques (28a, 28b, ... 28n) réunis en empilement étanche.

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