Polymerizable additives for making non-aqueous rechargeable...

H - Electricity – 01 – M

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Details

H01M 10/02 (2006.01) H01M 10/42 (2006.01) H01M 6/50 (2006.01) H01M 10/40 (2006.01)

Patent

CA 2205683

After undergoing overcharge abuse, non-aqueous rechargeable lithium batteries can be left in a relatively hazardous state of charge, representing a safety concern with respect to subsequent thermal or mechanical abuse. Electrolyte additives which electrochemically form conductive polymers can be used to create a short circuitinside the battery as a result of overcharge abuse and automatically discharge the battery internally. The invention is particularly suitable for batteries equipped with electrical disconnect devices which cannot be discharged externally after the disconnect has activated. Aromatic compounds such as biphenyl are particularly suitable additives.

Après avoir subi une surcharge, les batteries au lithium rechargeables à électrolyte non aqueux peuvent se trouver dans un état de charge relativement dangereux qui est préoccupant eu égard à la sécurité dans la perspective d'incidents thermiques ou mécaniques subséquents. On peut avoir recours à des additifs d'électrolyte qui forment électrochimiquement des polymères conducteurs pour créer un court-circuit à l'intérieur de la batterie par suite d'une surcharge et décharger automatiquement la batterie de l'intérieur. L'invention s'applique particulièrement aux batteries équipées de dispositifs disjoncteurs qui ne peuvent être déchargées de l'extérieur une fois que le disjoncteur a été actionné. Les composés aromatiques, tel le phénylbenzène, sont des additifs particulièrement appropriés.

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