Abstract: The invention concerns an alkaline Ni-Zn battery comprising both anolyte (E) partially or totally in the form of a viscous phase such as a gel, and catholyte (D) optionally in the form of a viscous phase, a microporous separator (A) between the anolyte and the catholyte, the anolyte and the catholyte having different compositions and volume, and an assembly of bipolar elements. The microporous separator is enclosed between impregnated macroporous separators (F) of the anolyte and the catholyte respectively. The total volume of the anolyte and of the catholyte is contained in the porosity of the macroporous separators and in the porosity of the electrodes. The microporous separator is for example based on cellulose or polypropylene. The inventive Ni-Zn battery has good charging/discharging cycles and low plate resistance.

Abstract: The invention concerns a composite plate for Pb/PbO2 batteries with bipolar electrodes, characterized by unidirectional electronic conduction provided by metal wires made at least at the surface of lead or lead alloy, arranged in a regular array and coated with a polymer, stable in an acid medium and capable of generating a strong bonding with the lead or lead alloy constituting the wire surface—the wire volume representing only at most 4% of the plate total volume at most. Hence the mass per unit area thereof remains of the order of 15 g/km2.

Abstract: An alkaline storage battery comprising at least one positive electrode and a negative zinc electrode in contact with an electrolyte via at least one electrolyte-impregnated separator is disclosed. The electrodes are clamped against two respective bipolar screens supported by a sealing frame. The positive electrode is in contact with a first electrolyte having a predetermined volume and composition via at least one first separator, the negative electrode is in contact with a second electrolyte having a predetermined volume and composition different from those of the first electrolytes via at least one second separator, and the first and second electrolytes are separated by a membrane forming a zincate and optionally aluminate filter, particularly an anionically conductive membrane defining first and second compartments.

Abstract: A bipolar electrode for alkaline batteries, including a conductive screen, a tridimensional collector provided with asperities which is plated on each side of the conductive screen, active material filling the collectors in order to constitute positive and negative electrodes, respectively, wherein at least one of each side of the conductive screen is grooved and the tridimensional collector is affixed to the conductive screen by means of a non-conductive adhesive, stable in the presence of a highly alkaline electrolyte, in direct contact with the external sides of the conductive screen by means of the asperities of the tridimensional collector.

Abstract: Bipolar electrode is provided with a conductive support/separator perforated on a part which is free from active material with at least one opening which communicates by a gaseous environment in a battery between elements assembled in series. The opening prevents the passage of electrolyte from one conductive support/separator to another, and may include an advantageously hydrophobic material, which also contains an opening therethrough, and is arranged on at least one side of the opening. The bipolar electrodes are particularly applicable to sealed batteries.

Abstract: The cadmium negative electrode has a structure serving as a collector and made of nickel foam. The sponge is filled with a mixture cons mainly of cadmium oxide and contains nickel sulphate hexahydrate in the proportion of 1.8 to 2.7% by weight of the total mixture, expressed in the form of nickel.

Abstract: The cadmium negative electrode has a structure serving as a collector and made of nickel foam. The sponge is filled with a mixture consisting mainly of cadmium oxide and contains nickel sulphate in the proportion of 1.8 to 2.7% by weight of the total mixture, expressed in the form of nickel.

Abstract: The positive nickel electrode is provided having a structure of cellular nickel foam filled with a paste based on nickel hydroxide. The paste contains (in dry matter and per 100 parts by weight nickel hydroxide) 7 to 8 parts by weight powder-form nickel metal, 5 to 12 parts by weight of a cobalt hydroxide and/or salt, the parts by weight being expressed as equivalents of cobalt metal.

Abstract: Collector support for lead/lead oxide batteries is made of a screen of electrolyte-resistant polymer coated with a conductive underlayer and a layer of lead or a lead rich alloy having a mass per surface comprised between 30 and 40 g/dm.sup.2 relative to the projected surface area of the collector support. The dimensions of the screen are such that no point inside the screen pattern is located at a distance greater than 2.5 mm from any strand of the screen.