Showing papers on "Current collector published in 1979"

Low cost bipolar current collector-separator for electrochemical cells

Abstract: A bipolar current collector-separator for electrochemical cells consists of a molded aggregate of electro-conductive graphite and a thermoplastic fluoropolymer combined in a weight ratio of 2.5:1 to 16:1. The bulk resistivity of such a molded bipolar current collector-separator is less than 4×10 -3 ohm inches (Ω in.). It has excellent corrosion resistance to a variety of feedstocks such as brine, aqueous HCl, etc. and to various electrolysis products such as caustic, chlorine, hydrogen, etc. In one alternative form the anodic side of a current collector-separator for a water electrolyzer is covered by a thin layer of a passivated metallic foil thus protecting the graphite current collector against attack by oxygen.

Wet proofed conductive current collector for the electrochemical cells

Abstract: An electrochemical cell such as a fuel cell comprising an ion exchange membrane electrolyte and catalytic electrodes bonded to the surface of the membrane is provided with a wet proofed carbon paper current collector at the oxidizing electrode. The use of a wet proofed carbon paper current collector allows axial current collection from the bonded electrodes thereby avoiding the need for conductive screens directly in the bonded electrodes. The wet proofed carbon paper by virtue of its hydrophobic character prevents flooding of the electrode by the cell product water.

Environment and brushes for high-current rotating electrical machinery

Abstract: A high-current electrical machine, comprises a stationary and a moving member and at least one current collector brush disposed between the members and in frictional contact with one member; where the brush comprises a plurality of flexurally independent, metal fibers, and where a non-oxidizing gaseous medium containing water vapor, contacts the interface of frictional contact of the brush to provide a lubricating effect.

Permeable mesh current collector for DC machines

Abstract: A current collector for an electrical machine employs a rotor collector ring encircled by a stator collector ring to which a compliant brush fabricated of an electrically-conductive, liquid metal-permeable material is attached. Liquid metal saturates said liquid metal-permeable material and forms a thin liquid metal film which makes sliding contact with the rotor collector ring, completing contact between the rotor and stator collector rings through the compliant brush. Adequate liquid metal is maintained in the collector by pumping means supplying liquid metal through the stator collector ring.

Metal-solid lubricant brushes for high-current rotating electrical machinery

Abstract: A high-current electrical machine, comprises a moving member and at least one current collector brush in interface contact with the moving member where the brush comprises a plurality of metal fibers plated with a metal-lubricant coating, the metal fiber and coating being annealed together, the coating being effective to provide a lubricating effect and minimize wear at the area of brush contact with the rotating member.

Sodium sulfur electrochemical cell or battery

Abstract: A stable, long life sodium/sulfur electrochemical cell or battery wherein the cathodic current collector has a boronized surface in contact with the cathodic reactant and an additional boron source in physical proximity to the boronized current collector surface. In one embodiment, the cathodic current collector is the can or electrode container thereby providing a stable, long life cell casing protected from corrosion effects.

Manufacture of battery equipped with rolled electrodes

Abstract: PURPOSE: To increae with certainty the weld strength between each electrode and its corresponding current collector in a battery equipped with rolled electrodes, by causing each current collector to contact with the edge of its corresponding rolled electrode which edge is protruding, arranging a pair of welding electrodes on the collector with a predetermined interval therebetween, and passing a current between the electrodes to weld the collector to the edge. CONSTITUTION: Beltlike positive and negative electrodes are rolled with a separator interposed therebetween while causing their edges to protrude respectively upwards and downwards. Then, a platelike positive electrode current collector 5 is brought into contact with the protruded part 1 of the core metal of the positive electrode. On the collector 5, a pair of welding electrodes 8, 8' are arranged with a clearance L which is 5mm or shorter. Then, a welding current is applied across the welding electrodes 8, 8', whereby heating and fusing the collector 5 between the welding electrodes 8, 8' to weld the collector 5 to the electrode edge. This welding is suitably performed at several locations. Then, the negative electrode collector 6 is also welded to the protruded edge 3 of the metal core of the negative electrode. It is preferable to weld the positive and negative electrode plats with their respctive collectors, each made of a metallic piece having no opening and being not thicker than 0.5mm, by means of an A.C. welding machine. COPYRIGHT: (C)1981,JPO&Japio

Process for producing alkaline battery

Abstract: PURPOSE:To improve leak resistance by applying an anticorrosion coating onto the sealing part of the negative electrode current collector which has been treated with a reducing gas to generate metal copper thereon. CONSTITUTION:In a positive electrode container 1 are filled positive electrode mix 2, separator 3, and absorbent 4 holding alkaline electrolyte. To the opening of the positive electrode container 1 is fitted a flat negative electrode current collector 7 filled with a negative electrode 6 composed mainly of zinc powder, with a polyamide gascket 5 inserted between the container 1 and the current collector 7. After sealing the fitting part, a button-shaped battery is formed. The current collector 7 is a stainless steel substrate with an internal copper layer 9 and an external nickel layer 10 coated thereon. That part of the copper layer 9 which comes in contact with the sealing part is subjected to reduction treatment with a gas containing a reducing gas such as hydrogen and then coated with an anticorrosion film 11 of benzotriazole and, preferably, with a liguid packing 13 such as silicone resin.

Sodium-sulphur electric cell

Abstract: The invention relates to a sodium-sulphur type electric cell. It includes a positive compartment which contains: a positive active material (2) which is liquid at operating temperature, and a positive current collector (1); a negative compartment which contains a negative active material which is liquid at operating temperature, and a negative current collector; a solid electrolyte tube (6) which separates the two compartments; characterized in that the positive current collector is at least partially coated with an electronically insulating layer (7), means (8) which are suitable for concentrating the lines of ionic current (10) which prevails between said electrolyte tube and said positive collector being provided in such a way that during the cell recharging process, the positive active material is deposited preferentially level with said means. The invention is used in electric cells for electric vehicles.

Static electricity detector

Abstract: PURPOSE:To prevent the deterioration of detection preciseness caused by applying insulating coating to a conductive hollow body, by mounting a means for regulating the resistance of an electric circuit formed in the space between a current collector and the conductive hollow body in said body. CONSTITUTION:A static electricity detection probe 7 is constituted from such a mechanism that a current collector 14 is supported by an insulating support 13 in a metal cylindrical case 12 and an output circuit is further connected to the current collector 14 through a connector resistance 16 while the current collector 14 is connected to the case 12 through high resistance 17. alpha-Rays radiated from the current collector 14 irradiates the bottom surface 11 of a liquid-tight space 10 which is, in turn, ionized to form an electric circuit. The resistance R2 of this circuit is proportional to the distance between the current collector 14 and the bottom surface 11. Therefore, the position to be inserted and mounted of the cylindrical case 12 is adjusted up and down to enable the adjustment of R2. As mentioned above, by properly selecting the position to be inserted and mounted for the case 12, the deterioration of detection preciseness of a conductive hollow body having insulating coating applied thereto can be prevented.