Abstract: A lead-acid storage battery includes a connecting terminal assembly which comprises: a bushing made from lead or lead alloy, buried in a cover of the battery in the same process as when the cover is molded, and including a hole into which a pole is fitted; and a connecting terminal made by press working of metal, except for lead or lead alloy, having a good electrical conductivity, having at least one bolt-insertion hole and a space for accommodating a nut, fixed to the upper portion of the bushing, and having a strength resistive to a torque of 40 kg-cm or more caused by a bolt inserted into the bolt-insertion hole.

Abstract: A sodium-sulfur storage battery comprises a battery housing which functions as a positive current terminal collector, a solid electrolyte tube which is permeable to sodium ion and is disposed in the battery housing, and a positive electroconductive material, into which positive reactant is impregnated, disposed in a positive chamber between the solid electrolyte tube and the battery housing. The positive electroconductive material has a rugged part consisting of longitudinally extending concave and convex portions, which are formed by compression molding, at the inner surface thereof.

Abstract: An electrolyte feeder for battery including an electrolyte container, said container comprising a shell body filled with an electrolyte in a plurality of spaced cell units, equal in number to the number of individual cells in a dry changed storage battery, each of said shell bodies having a filling tube, said filling tubes being spaced to coincide with the spacing between filling ports of said battery to enable the filling tubes to fit into the corresponding one of the filling ports, a thin film being formed at a tip end of the filling tube, and said thin film sealing up each shell body.

Abstract: A sodium-sulfur storage battery comprises an alpha alumina ring, a sodium conductive solid electrolyte tube and solder glass jointing said ring and said tube together; and is characterized in that the alpha alumina ring is provided at its open end with a groove for collecting the solder glass, a width of said groove is in a range from 0.2 mm to 5 mm and a depth of said groove is in a range from 0.2 mm to 10 mm. A surface of the solder glass is formed at a position inner than an end surface of the alpha alumina ring. Said groove may have a section of a rectangular shape. An inside surface of said groove may have a section of a round shape or an oblique section.

Abstract: The sodium sulfur storage battery comprises a solid electrolyte tube; metallic fiber filled in said solid electrolyte tube; powder, grain or mixture of them of substance resistant to attack by molten sodium which has porosity smaller than that of the metallic fiber and is filled in a first space above the metallic fiber; a battery housing; a positive electroconductive material disposed in a space between the battery housing and the solid electrolyte tube; a ring disposed on the upper surface of the positive electroconductive material; powder, grain or mixture of them of substance resistant to attack by molten sulfur which is filled in a second space above said ring and is prevented from dropping by said ring; and a solder glass layer arranged on a portion of the outer peripheral surface of the solid electrolyte tube in said second space.

Abstract: A manufacturing method of a sodium-sulfur storage battery wherein a negative cover is thermocompressively jointed to an upper surface of an alpha alumina ring which are jointed with solder glass to a solid electrolyte tube, and a positive cover is thermocompressively jointed to a lower surface of said alpha alumina ring, is characterized in that diffusion layers of chrome are provided on the surfaces of the negative and positive covers, coating layers of aluminum are provided at least on the surfaces, which are thermocompressively jointed, of the negative and positive covers, and thermocompressively jointing surfaces are thermocompressively jointed in the air with aluminum rings thereon, respectively. Said negative and positive covers may be made from stainless steel, iron or alloy of iron and nickel. Said chrome diffusion layers may be about 20.mu.-120.mu. in thickness, respectively, and said aluminum layers may be about 5.mu.-90.mu. in thickness, respectively.

Abstract: The present disclosure describes a sodium-sulfur storage battery comprising a sodium-ion conductive solid electrolyte tube; a positive electroconductive material consisting of graphite felt or carbon felt, and a metal sulfide layer disposed between the solid electrolyte tube and the positive electro-conductive material. Said metal sulfide layer may be sulfurated metal such as aluminum, nickel, copper, iron, tin, zinc, lead, magnesium and chrome. A metal member may be disposed between the solid electrolyte tube and the positive electroconductive material to form said metal sulfide layer by a sulfurated part formed at least at the surface of said metal member.

Abstract: An electrolyte container for simultaneously filling electrolyte into the individual cells of a multi-cell dry-charged storage battery comprising a shell body having a plurality of spaced cell units, corresponding in number to the battery to be filled and each containing the quantity of electrolyte required to fill the corresponding battery cell, each container cell unit including a flow regulator, a sealed tip and a cutting line between the tip and flow regulator for cutting and removing the tip when the container is to be used to fill the cells of a dry-charged battery.

Abstract: The present invention discloses a manufacturing method of a sodium-sulfur storage battery comprising battery components of metallic members jointed by means of a thermocompression method to an .alpha.-alumina ring which is jointed to a sodium ion conductive solid electrolytic tube using solder glass. According to the invention, thicknesses of the metallic members thermocompressively jointed to upper and lower surfaces of said .alpha.-alumina ring is in a range from about 0.2 mm to about 0.6 mm. Plate-shaped aluminum rings are disposed between said .alpha.-alumina ring and said metallic members respectively and are thermocompressively jointed in air under condition of a temperature in a range from about 600.degree. to about 625.degree. C. and a pressure in a range from about 1200 to about 1600 kg/cm.sup.2.

Abstract: The present invention discloses a sodium-sulfur storage battery utilizing an inside of a sodium-ion conductive solid electrolyte tube as a negative chamber, comprising an .alpha.-alumina ring jointed with solder glass to an open end of said electrolyte tube, a flanged aluminum housing having a fine hole at its bottom incorporated in said solid electrolyte tube, a negative auxiliary cover thermo-compressively jointed through a flange of said aluminum housing to an upper surface of said .alpha.-alumina ring, and a negative cover provided with a negative current collector terminal welded to said negative auxiliary cover.

Abstract: A method of producing a hydrophilic membrane from a polyethylene base film by first irradiating the film with ionizing radiation in air or an oxygen atmosphere and then grafting acrylic acid and/or methacrylic acid onto the irradiated film at low temperatures.

Abstract: A novel process for the production of a separator for use in a cell to prevent the short-circuiting of positive active material and negative active material comprises irradiating a polyolefin film 150 .mu.m or less thick with ionizing radiation at a dose rate of 5.times.10.sup.4 -10.sup.7 rads/sec. to give a total dose of 1 Mrad or more, contacting the irradiated film with an aqueous solution of a terminally unsaturated monomer such as acrylic acid, methacrylic acid and the like at a temperature of 10.degree. C.-60.degree. C. to thereby cause grafting of the monomer onto the polyolefin film before the grafted polymer film is treated with an aqueous alkaline solution to finally obtain the separator for use in a cell, which is substantially improved in that it shows low electrical resistance and is excellent both in its acid resistance and mechanical strength.

Abstract: There is disclosed a novel cell separator made of a grafted membrane comprising a polyethylene film which is graft-copolymerized with a monomer having an ion exchange group, characterized in that said membrane has an area which is not grafted at all or an area of low degree grafting. By making use of this membrane, a small size and thin cell having excellent performance as well as satisfactory mechanical strength can be produced at low cost with great advantages.

Abstract: A method of producing a dimensionally stable battery separator characterized by grafting acrylic acid and/or methacrylic acid onto a polyethylene film, treating the resulting membrane with an aqueous alkaline solution, and drying the treated membrane under application of tension.

Abstract: A battery separator composed of a composite sheet of film to which a monomer having a hydrophilic or electrolytic group is grafted is disclosed. Said film consists of a first polymeric layer containing a substance capable of catching a metal ion dissolved from a positive or negative active material and a second polymeric layer integrally bonded to either one or both sides of the first polymeric layer and which contains no such substance or contains it in a smaller amount that that contained in said first polymeric layer. Also disclosed is a method of producing a battery separator by irradiating such composite sheet of film with ionizing radiation and immersing the irradiated film in a solution of a monomer containing a hydrophilic or electrolytic group or bringing it into contact with the monomer solution to thereby graft the monomer to the film.

Abstract: A process is, herein, disclosed for preparing a membrane used for prevention of short-circuiting between the anode and the cathode of a battery comprising contacting a polyethylene film with an aqueous solution of acrylic acid, water, ethylene dichloride and ferrous salt or cupric salt and irradiating with ionizing radiation to obtain a polyethylene film with acrylic acid molecules grafted uniformly thereon.