Electrochemical cell with two types of separators

Details Electrochemical cell with two types of separators Electrochemical cell with two types of separators

H - Electricity

01

M

H01M 2/14 (2006.01)

Patent

CA 2561749

Provided is an electrochemical device comprising two types of separators having different energy to break, wherein the outermost electrode layer of the electrode assembly includes an active material non-coated cathode, an active material non-coated anode, and a separator (second separator) disposed between the cathode and anode and having relatively low energy to break compared to that of separators (first separator) in other electrode layers. Therefore, it is possible to remarkably improve safety of the battery by including primary short-circuiting in the outermost electrode layer of a battery, thus facilitating heat dissipation of the battery, upon application of external impact.

L'invention porte sur un dispositif électrochimique comprenant deux types de séparateurs ayant une énergie différente à la rupture. La couche d'électrode la plus à l'extérieur de l'ensemble électrode comprend une cathode active non enrobée de matériau, une anode active non enrobée de matériau et un séparateur (second séparateur) placé entre la cathode et l'anode et ayant une énergie à la rupture relativement faible comparée à celle des séparateurs (premier séparateur) des autres couches d'électrode. Il est donc possible d'améliorer considérablement la sécurité de la batterie en induisant une mise en court-circuit primaire dans la couche d'électrode la plus à l'extérieur de la batterie, ce qui facilite la dissipation de chaleur de cette batterie lors d'un impact extérieur.

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