Lithium battery protected from intrusion by pointed elements

Abstract

The invention relates to a lithium battery, the operation of which is security-protected by the interposition of resilient films. The battery is made up of a battery cell PEN, which comprises a film of an electrolyte E containing a lithium salt between a film P forming a positive electrode and a film N forming a negative electrode, or made up of a stack of battery cells PEN, said stack comprising two terminal battery cells between which are optionally placed one or more intermediate battery cells, said battery being characterized in that it comprises at least two protective films Fp made of a resilient material, at least one of the electrodes of the battery cell or of each terminal battery cell being in contact with a protective film Fp made of a resilient material. In particular, at least two protective films Fp are made of a resilient material having an elongation at break denoted by aand a thickness denoted by e, at least one of said protective films Fp in contact with a connection layer, for connecting an electrode, having a thickness e, said film having a thickness esuch that e>e/a. The invention relates to 'lithium' batteries, the negative electrode of which is made of lithium metal, and to 'lithium ion' batteries, the negative electrode of which comprises a lithium-ion insertion material.