Method for manufacturing an all-solid battery made of thin films, comprising the following successive steps: a) a layer comprising at least one anode material, here called "layer of anode material", is deposited on its conductive substrate, preferably selected from the group formed by a metal sheet, a metal strip, a metallised insulating sheet, a metallised insulating strip, a metallised insulating film, said conductive substrates, or their conductive elements, being able to act as an anode current collector; b) a layer comprising at least one cathode material, here called "layer of cathode material", is deposited on its conductive substrate, preferably selected from the group formed by a metal sheet, a metal strip, a metallised insulating sheet, a metallised insulating strip, a metallised insulating film, said conductive substrates, or their conductive elements, being able to act as a cathode current collector, with it being understood that steps a) and b) can be inverted; c) a layer comprising at least one solid electrolyte material (here, called "layer of electrolyte material") is deposited on at least one layer obtained in step a) and/or b); d) a layer of a solution of an ionic conductive material, preferably, at least one lithium salt is deposited: ∘ either on the layer of anode material coated with a layer of solid electrolyte material and/or on the layer of cathode material coated or not coated with a layer of solid electrolyte material; ∘ or on the layer of cathode material coated with a layer of solid electrolyte material and/or on the layer of anode material coated or not coated with a layer of solid electrolyte material; e) said layer of said solution of the ionic conductive material obtained in step d) is dried in order to obtain a layer of an ionic conductive material; the thickness of the layer of said ionic conductive material being less than 10μm, preferably less than 5μm, and even more preferably less than 2μm; f) a layer of anode material obtained in step a), c) or e) is successively stacked, face on face, with a layer of cathode material obtained in step b), c) or e), with it being understood that the stack comprises at least one layer of solid electrolyte material obtained in step c) and at least one layer of an ionic conductive material obtained in step e); g) a heat treatment and/or mechanical compression of the stack obtained in step f) is carried out in order to obtain an all-solid battery made of thin films, wherein the thickness of each of the thin films present in the battery is less than 10μm and preferably less than 5μm. a) a layer comprising at least one anode material, here called "layer of anode material", is deposited on its conductive substrate, preferably selected from the group formed by a metal sheet, a metal strip, a metallised insulating sheet, a metallised insulating strip, a metallised insulating film, said conductive substrates, or their conductive elements, being able to act as an anode current collector; b) a layer comprising at least one cathode material, here called "layer of cathode material", is deposited on its conductive substrate, preferably selected from the group formed by a metal sheet, a metal strip, a metallised insulating sheet, a metallised insulating strip, a metallised insulating film, said conductive substrates, or their conductive elements, being able to act as a cathode current collector, with it being understood that steps a) and b) can be inverted; c) a layer comprising at least one solid electrolyte material (here, called "layer of electrolyte material") is deposited on at least one layer obtained in step a) and/or b); d) a layer of a solution of an ionic conductive material, preferably, at least one lithium salt is deposited: ∘ either on the layer of anode material coated with a layer of solid electrolyte material and/or on the layer of cathode material coated or not coated with a layer of solid electrolyte material; ∘ or on the layer of cathode material coated with a layer of solid electrolyte material and/or on the layer of anode material coated or not coated with a layer of solid electrolyte material; ∘ either on the layer of anode material coated with a layer of solid electrolyte material and/or on the layer of cathode material coated or not coated with a layer of solid electrolyte material; ∘ or on the layer of cathode material coated with a layer of solid electrolyte material and/or on the layer of anode material coated or not coated with a layer of solid electrolyte material; e) said layer of said solution of the ionic conductive material obtained in step d) is dried in order to obtain a layer of an ionic conductive material; the thickness of the layer of said ionic conductive material being less than 10μm, preferably less than 5μm, and even more preferably less than 2μm; f) a layer of anode material obtained in step a), c) or e) is successively stacked, face on face, with a layer of cathode material obtained in step b), c) or e), with it being understood that the stack comprises at least one layer of solid electrolyte material obtained in step c) and at least one layer of an ionic conductive material obtained in step e); g) a heat treatment and/or mechanical compression of the stack obtained in step f) is carried out in order to obtain an all-solid battery made of thin films,