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A cell for the production of aluminium by the electrolysis of an aluminium compound dissolved in a molten electrolyte, in which an outer mechanical structure forming an outer shell (21) houses therein one or more inner electrically-conductive cathode holder shells or plates (31) which contain a cath

A cell for the production of aluminium by the electrolysis of an aluminium compound dissolved in a molten electrolyte, in which an outer mechanical structure forming an outer shell (21) houses therein one or more inner electrically-conductive cathode holder shells or plates (31) which contain a cathode mass (32) and is/are connected electrically to the busbar. The cathode mass (32) has an aluminium-wettable top surface (37), preferably at a slope forming a drained cathode. The inner cathode holder shell or shells (31) is/are separated from the outer shell (21) by an electric and thermic insulation (40), the cathode holder shell(s) (31) also serving to distribute current uniformly to the cathode mass (32). The or each cathode (30) formed by the cathode holder shell (31) and cathode mass (32) is removable from the cell as a unit.

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1. A cell for the production of aluminium by the electrolysis of an aluminium compound dissolved in a molten electrolyte, comprising an outer mechanical structure forming an outer shell one or more cathodes and an electric and thermic insulation separating the or each cathode from the outer shell, t

1. A cell for the production of aluminium by the electrolysis of an aluminium compound dissolved in a molten electrolyte, comprising an outer mechanical structure forming an outer shell one or more cathodes and an electric and thermic insulation separating the or each cathode from the outer shell, the outer shell and the electric and thermic insulation forming a recess that houses the or each cathode, the or each cathode comprising an inner electrically-conductive cathode holder supporting and substantially coextensive with a cathode mass, the cathode holder being connected electrically to a busbar, the or each cathode holder also serving to distribute current to its cathode mass, wherein the or each cathode holder and the thereon supported cathode mass are movable as an individual cathode unit within said recess for insertion therein and removal therefrom of said individual cathode unit.