Method and line for filling containers of electrochemical cells and battery production method

A line for filling containers of electrochemical cells with electrolyte, comprising:

• a conveyance path of the containers;
• a filling station configured to fill filling units with said electrolyte;
• a coupling station configured to couple each filling unit to a respective one of the containers, thus forming a unitary assembly for transferring the electrolyte from the filling unit to the container coupled thereto;
• a separation station configured to uncouple, after transferring electrolyte to the container, each filling unit from the respective container,
• further comprising a conditioned room delimited by walls that separate an environment inside the conditioned room from an environment outside the conditioned room, the pressure and/or humidity conditions of the environment inside the conditioned room being different from the outside environment, wherein said filling station, said coupling station and said separation station are arranged inside said conditioned room,
• and wherein said conveyance path of the containers extends along a first portion located inside the conditioned room, passing from the filling station to the coupling station, and along a second portion located at least partially outside the conditioned room, passing from the coupling station to the separation station, so that transfer of said electrolyte from the filling unit to the container coupled thereto can occur at least partially in the environment outside the conditioned room.