Abstract: The air-depolarized cell comprises a positive electrode having a catalytic mass, a negative electrode, an electrolyte disposed between the electrodes, a gas space above the assembly formed by the negative electrode and the electrolyte, a ventilation duct passing through the positive electrode to convey oxygen into the catalytic mass, and a source of oxygen which is separated from the said gas space by a wall impermeable to oxygen. In accordance with the invention the said duct is connected to the said source of oxygen by a tube impermeable to oxygen which is hermetically sealed to the said wall and to the catalytic mass which is situated entirely below the free surface of the electrolyte.

Abstract: The invention relates to an air-depolarized primary cell which includes a container (1), a negative electrode (4) disposed against the walls of the container, a positive electrode (3) disposed in the central portion of the container and a ventilation circuit (6, 8, 9, 28) for the positive electrode; a gas-filled space (15) is provided above the negative electrode and the electrolyte for accommodating the negative electrode as it expands during use; the space is delimited by the ventilation circuit, the walls of the container and a wall (26) which is impermeable to oxygen. In accordance with the invention, the periphery of the impermeable wall has a step configuration rim (27, 30) welded to the walls of the container, this avoids cracks damaging the seal (17) between the impermeable wall (26) and the ventilation circuit when the walls of the container (1) are deformed by the expanding negative electrode.

Abstract: The invention relates to a discharge indicator of an electrochemical generator such as a cell or battery comprising a consumable negative electrode basically containing powdered metal, for example, zinc. The said indicator is constituted by an enclosure containing a substance which can be seen from the outside of the battery and having an appearance which changes on coming into contact with the electrolyte, the said enclosure being closed by a metal plate arranged within the negative electrode and which is made of a material chosen from among zinc, zinc alloys, zinc amalgams. Application of the indicator is to air depolarization cells.