Electrochemical cell for polymer electrolyte-lithium batteries (ACEP)

Claim 1

Electrochemical cell comprising a superposition of layers of a positive electrode, a solid polymer electrolyte, lithium negative electrode, the positive electrode being in contact with a layer of metallic collector and the negative electrode being covered by an insulating film, the negative electrode and collector layers being offset with respect to each other so as to enable lateral current collection, the collector then having a protected free edge, said cell being protected by incorporating in said electrochemical cell a band of an insulating material which does not react with materials of the electrodes and of the electrolyte and is not deformed at the temperatures where said cell is used, said band of insulating material being placed between layers constituting said cell so that when the various layers including the collector and the insulating film are laminated to constitute the cell, said band prevents the free edge of the collector from cutting through the layer of electrolyte and/or thereby short-circuiting the two electrodes, said insulating band also capable of ensuring insulation between the collector and the negative electrode when the electrolyte is shorter than the collector on its free edge side or when the collector consists of a material which reacts electrochemically with lithium such as metallized polyester.