Abstract: Method for charging a sealed storage cell battery according to which the battery is heated when its temperature lies below a determined value and the intensity of the charge current is lowered by being shunted to heat the battery when the voltage of the battery reaches a given value, characterized in that the said value of the voltage of the battery supplies the signal which causes the heating of the battery; and device for implementing the method.

Abstract: Electric cell having a positive electrode comprising an active material intimately intermixed with an electronic conductor, a negative electrode and an electrolyte whose solvent is a non-aqueous liquid. According to the invention, the said electronic conductor is selected so as to bring down the discharge voltage peak of the cell occurring at the beginning of the discharge to or close to the desired operative voltage discharge level required in use of the cell. Batteries according to the invention are advantageously used in watches.

Abstract: The invention concerns an air depolarization cell or battery. The positive electrode is supplied with air through at least one cavity formed by at least two funnels formed directly by molding or otherwise in the mass of the positive electrode separated by a portion of the mass of the positive electrode, each funnel communicating with the outside air at one of their ends and communicating together by a passageway similarly formed directly in the mass of the positive electrode at the level of their other ends. The ratio between the area of the surface of each funnel through which air flows into the electrode and the volume of air therein is different for the two funnels.

Abstract: Seal in the cover of a storage cell for a malleable metal terminal post such as lead or indium terminal post provided with a blind hole opening towards the outside and a shoulder inside the storage cell. A flexible gasket is situated between the cover and the shoulder. An expandable rivet or the like is inserted in the blind hole and has a head that bears on the external face of the cover. Extraction of the rivet expands and shortens the terminal post and compresses the flexible gasket into sealing relationship between the shoulder and the cover without causing the expanded portion of the terminal post to come into contact with the cover thus avoiding danger of cracking the latter. Application is to small sealed lead storage cells.

Abstract: Method for recovering potassium hydroxide and zinc oxide from potassium zincate solutions, characterized in that a selective solvent of potassium hydroxide, which is miscible with water, is added to the zincate solution, in that the zinc oxide precipitate thus obtained is filtered and in that the mother liquors for separating the potassium hydroxide solution from the solvent are treated. The invention applies to all electrochemical storage cell batteries having a zinc negative electrode in which it is required to purify the electrolyte with a view to scavenging it.

Abstract: Alkaline electrolyte electric primary cell comprising a visual indicator of its state of charge, the said primary cell having a negative electrode basically containing zinc powder in contact with its outside casing. The said charge indicator is constituted by a perforated copper or copper alloy sheet which is visible from the outside of the primary cell and is in contact with the negative mass. On assembly, the copper sheet becomes coated with a film of zinc and appears to have a grey color. During cell discharge the zinc of this film oxidizes and the original coloration of the sheet comes visible through a transparency provided in at least a portion of the casing. The sheet may be located at any selected depth in the thickness of the negative electrode and the time of restoration of original coloration is a function of the location depth and thus indicative of the residual state of charge.

Abstract: The invention concerns a nut system comprising a nut connected with a nut lock constituted by a washer having the same inside diameter as the nut. In such a system, the nut and the washer are tied together while remaining rotatable relative to each other and capable of assuming a first relative position in which they are coaxial and a second relative position in which they are eccentric, thus becoming tightened in the eccentric position.

Abstract: The invention concerns an electric cell having a fluid-tight box comprising a metallic tank having a bottom and a lateral wall and at least one current output insulated from the tank. That cell is characterized more particularly in that the housing comprises, moreover, a metallic sleeve surrounding the lateral wall of the tank, stopped up in a fluid-tight manner at its first end by the tank and at its second end by a glass seal through which the current output crosses in a fluid-tight manner. The glass seal and metallic sleeve have substantially equal coefficients of expansion. The invention applies to electrochemical cells having small dimensions and more particularly to lithium cells.

Abstract: Primary cell, in which the positive active material is silver chromate and in which the electrolyte may be constituted by a lithium perchlorate solution in propylene carbonate. According to the invention silver powder is added to the silver chromate in a proportion comprised between 5% and 30% by weight. A primary cell thus obtained may be used in an environment having a high temperature, such as an electrical device whose components heat up without any possibility of cooling.

Abstract: Gelled electrolyte for electrochemical generators, of the type comprising an alkaline solution to which is added a gelling agent. The said agent comprises modified or reticulated starches. The gelled state of these electrolytes is maintained, whatever the concentration of the alkaline solutions used may be.

Abstract: The invention relates to high energy density electrochemical generators of the alkaline, more particularly lithium, negative electrode type. An electrolyte whose solvent contains 1-3 dioxane, dioxolane or propylene oxide, preferably mixed with propylene carbonate or ethylene carbonate is utilized.This electrolyte has excellent conductivity, even at a relatively slight concentration of the solute. Lithium perchlorate is preferred as the solute and copper oxide, monovalent silver chromate, lead chromate, fluorinated carbons, polymerized fluorinated carbons or mixtures of these latter with metal compounds are preferred as active positive material.

Abstract: Electro-chemical generators of the button type in which a stack of alternate positive and negative electrodes with separators between electrodes of opposite polarity are enclosed between two collectors which serve as terminals of opposite polarity for the generator. The assembly of electrodes, separators and collectors together with requisite electrolyte are held together by a molded insulative plastic frame which has portions overlying the peripheries of the collectors and which also may penetrate to a limited extent in the space between the peripheries of the collectors as by an insulative body encircling the electrode separator assembly. This body may be an electrically insulative ring, or an elastomer seal member.

Abstract: Electrical voltage indicating device for use in the low-voltage range, characterized in that it comprises at least one electrochemiluminescence cell containing at least two electrodes immersed in an electrolyte containing at least one electrochemical substance whose luminescent excitation threshold value corresponds to the value of a voltage to be monitored. The use of several such substances each having a different luminescent excitation threshold in the same cell or of several cells, each with a substance of different excitation threshold value connected in parallel makes it possible to monitor several different voltage values with the device.

Abstract: The invention relates to semi-open battery of storage cells each likely to evolve a large volume of hydrogen, more particularly during overcharge.A battery according to the invention comprises an intermediate or dummy lid so located with respect to the regular lid of the battery to enable the inflammable gas flow generated in the cells to be isolated from the flow of fluid or gas serving for cooling of the electrical connections of the storage cells and thus avoiding or eliminating all danger of explosion.

Abstract: Valve means intended more particularly for a sealed storage cell battery; that valve is made to communicate with the compartments of all the storage cells by way of independent passages for piping gases from each cell to an exhaust passage. The valve is responsive independently to gas pressure conditions in each cell to open or close the particular passage from said cell irrespective of pressure conditions in other cells. It is thus used by all the storage cells.