Abstract: In this field it is a problem to find practical technical solutions for heat recovery at the same time as regulation and control of the temperature conditions during cell operation is difficult, especially when cooling of the cell is intended. The arrangement comprises cooling chambers (6A, 6B, 6C, 6', 51) each having a base area covering a small proportion of the surface of each cell. Together these cooling chambers cover a substantial proportion of the cell surface without any significant space between the cooling chambers. These are adapted to receive a through-flow of a cooling medium which is controlled (8A, 8B, 8C) individually for each cooling chamber, and the cooling medium preferably is helium.