A method for producing an all-solid thin-layer battery including the following series of steps: a) a layer including at least one anode material (referred to here as "anode material layer") is deposited on its conductive substrate, preferably selected from the group formed by a metal sheet, a metal strip, a metallized insulating sheet, a metallized insulating strip, a metallized insulating film, said conductive substrates, or conductive elements thereof, capable of serving as an anode current collector; b) a layer including at least one cathode material (referred to here as "cathode material layer") is deposited on its conductive substrate, preferably selected from the group formed by a metal sheet, a metal strip, a metallized insulating sheet, a metallized insulating strip, a metallized insulating film, said conductive substrates, or conductive elements thereof, capable of serving as a cathode current collector, with the understanding that steps a) and b) can be reversed; c) on at least one layer obtained in step a) and/or b), a layer including at least one solid electrolyte material having a thickness of less than 10 μm, preferably less than 5 μm and even more preferably less than 2 μm (referred to here as "electrolyte material layer") is deposited, the solid electrolyte material including a solid cross-linked polymer material comprising ionic groups, said solid cross-linked polymer material being preferably chosen from polymethyl methacrylates, polyamines, polyimides or polysiloxanes; d) the following are stacked face to face: - an anode material layer coated with a solid electrolyte material layer obtained in step c) with a cathode material layer coated or not with a solid electrolyte material layer obtained in step c); - or a cathode material layer coated with a solid electrolyte material layer obtained in step c) with an anode material layer coated or not with a solid electrolyte material layer obtained in step c); e) a heat treatment and/or a mechanical compression of the stack obtained in step d) is performed in order to obtain an all-solid thin-layer battery. a) a layer including at least one anode material (referred to here as "anode material layer") is deposited on its conductive substrate, preferably selected from the group formed by a metal sheet, a metal strip, a metallized insulating sheet, a metallized insulating strip, a metallized insulating film, said conductive substrates, or conductive elements thereof, capable of serving as an anode current collector; b) a layer including at least one cathode material (referred to here as "cathode material layer") is deposited on its conductive substrate, preferably selected from the group formed by a metal sheet, a metal strip, a metallized insulating sheet, a metallized insulating strip, a metallized insulating film, said conductive substrates, or conductive elements thereof, capable of serving as a cathode current collector, with the understanding that steps a) and b) can be reversed; c) on at least one layer obtained in step a) and/or b), a layer including at least one solid electrolyte material having a thickness of less than 10 μm, preferably less than 5 μm and even more preferably less than 2 μm (referred to here as "electrolyte material layer") is deposited, the solid electrolyte material including a solid cross-linked polymer material comprising ionic groups, said solid cross-linked polymer material being preferably chosen from polymethyl methacrylates, polyamines, polyimides or polysiloxanes; d) the following are stacked face to face: - an anode material layer coated with a solid electrolyte material layer obtained in step c) with a cathode material layer coated or not with a solid electrolyte material layer obtained in step c); - or a cathode material layer coated with a solid electrolyte material layer obtained in step c) with an anode material layer coated or not with a solid electrolyte material layer obtained in step c); - an anode material layer coated with a solid electrolyte material layer obtained in step c) with a cathode material layer coated or not with a solid electrolyte material layer obtained in step c); - or a cathode material layer coated with a solid electrolyte material layer obtained in step c) with an anode material layer coated or not with a solid electrolyte material layer obtained in step c); e) a heat treatment and/or a mechanical compression of the stack obtained in step d) is performed in order to obtain an all-solid thin-layer battery.