CURRENT COLLECTORS FOR SAFE ELECTROCHEMICAL GENERATORS, PREPARATION PROCESSES AND GENERATORS THEREFROM

摘要

Self-protective current collector with sideways collection, for thin-film electrochemical generator with polymeric solid electrolyte, utilising electrodes operating with respect to alkaline or alkaline-earth ions. The collector includes an insulating plastic backing film of between approximately 1 and 30 microns thickness, the film being chosen for its compatibility with the chemical environment of the generator and treated as needed for adhesion to at least one of its faces, a conductive metal coating with a thickness of less than approximately 10 microns, adhering to at least one face of the insulating backing film, chosen for its compatibility with the corresponding electrode material of the generator, and characterised in that its conductive surface is divided into a multitude of distinct adjacent zones, each zone being electrically isolated by non-conductive borders with the exception of at least one conductive bridge of small cross-section and linked to a common conductive side margin allowing sideways collection of the set of distinct zones. The nature and electrical resistance of the conductive bridges are chosen so as to allow, on the one hand, the passage of currents corresponding to the maximum currents provided for each of the individual collection zones of the anticipated generator and, on the other hand, to limit, in the case of an accidental short-circuit inside a zone, the maximum current received by this zone coming from the set of zones of the generator. Production process for this collector, collector-electrode assembly and generator using the collector or the collector-electrode assembly.