Abstract: The invention relates to a rechargeable electrochemical battery cell. Said cell comprises a negative electrode (5), an electrolyte (19), and a positive electrode, the negative electrode (5) having a an electronically conductive substrate (14), onto which an active mass (15) is electrolytically deposited during the charging of the cell. The aim of the invention is to significantly improve the operational safety of said cell. To achieve this, the cell in contact with the substrate (14)of the negative electrode (5) has a porous structure (16)formed by solid particles (17), which is configured and positioned in such a way that the active mass (15), which is deposited during the charging of the cell, penetrates from the surface of the substrate (14) into the pores (18) of the latter and is deposited again therein.

Abstract: Rechargeable battery cell operable at normal temperature, with an SO.sub.2 based electrolyte system, a negative electrode and a positive electrode, wherein one of the electrodes has an electronically conductive discharge element. An improved cycle stability and consequently a longer useful lifetime is achieved in that, as a reaction protection material to protect the discharge element against unwanted reactions with constituents of the SO.sub.2 based electrolyte system, at least a surface layer of the electronically conductive discharge element contains an alloy of chrome with another metal and/or a protective metal, selected from rhodium, tungsten, rhenium, tantalum, platinum, iridium, osmium or technetium in pure form, as an alloy or as a constituent of a compound and/or a carbide, nitride or phosphide of titanium, nickel, cobalt, molybdenum, iron, vanadium, zirconium or manganese.

Abstract: A rechargeable electrochemical battery cell having a negative electrode (5), an electrolyte (19), and a positive electrode (4), the negative electrode (5) having an electronically conductive substrate (14), on which an active mass (15) is electrolytically deposited when the cell is charged. A significant improvement of the operating safety is achieved in that the cell has a porous structure (16) made of solid particles (17) in contact with the substrate (14) of the negative electrode (5), which porous structure is formed and positioned in such a manner that the active mass (15) deposited during charging of the cell penetrates from the surface of the substrate (14) into its pores (18) and is further deposited therein.

Abstract: Rechargeable battery cell operable at normal temperature, with an SO2 based electrolyte system, a negative electrode and a positive electrode, wherein one of the electrodes has an electronically conductive discharge element. An improved cycle stability and consequently a longer useful lifetime is achieved in that, as a reaction protection material to protect the discharge element against unwanted reactions with constituents of the SO2 based electrolyte system, at least a surface layer of the electronically conductive discharge element contains an alloy of chrome with another metal and/or a protective metal, selected from rhodium, tungsten, rhenium, tantalum, platinum, iridium, osmium or technetium in pure form, as an alloy or as a constituent of a compound and/or a carbide, nitride or phosphide of titanium, nickel, cobalt, molybdenum, iron, vanadium, zircon or manganese.

Abstract: An electrochromic unit (1) having an electrochemical cell with at least two electrodes (3, 4) applied to a carrier, an electrolyte (2) located between the electrodes (3, 4) and an electrochromic material (7), such as an electrochromic polymer, applied to one of the electrodes (3), is characterized by a proton exchange membrane (2) as a solid electrolyte and carrier for the bilaterally applied electrodes (3, 4), the electrochromic material (7) being positioned on the side of the electrode (3) carrying it remote from the membrane (2).