Showing papers on "Current collector published in 1991"

Current collector for conducting current between neighbouring piled high temperature fuel cells

Abstract: Current collector (6; 11) for stacked high-temperature fuel cells (1; 2; 3) containing a solid electrolyte (1). The oxygen electrode (2) of one fuel cell is electrically connected to the fuel electrode (3) of the subsequent fuel cell via a gastight partition (4) which separates the different gaseous media comprising fuel (CH4) and an oxygen carrier (O2). The partition consists of a plurality of elements which are completely elastic at an operating temperature of 800 to 1000 DEG C and are composed of an iron-based or nickel-based alloy containing not less than 15% by weight of Cr and not less than 4% by weight of Al. It has curved dome-like contact points (7) in the form of porous drops, not more than 80 mu m thick and 1.5 mm wide, of Pt or Pd or an alloy of these metals. Variants having an interlayer composed of Ni or Au.

Cathode current collector material for solid cathode cell

Abstract: A highly alloyed nickel-containing ferritic stainless steel material for use as a cathode current collector for lithium solid cathode cells is provided The material does not require costly melting practices and provides high corrosion resistance particularly where elevated temperature, 72° C or higher, storage and performance is required relative to other cathode current collector materials thereby increasing cell longevity

Component disposition for current conduction of ceramic high temperature fuel cell

Abstract: PURPOSE: To maintain proper electrical contact, high temperature conductivity and low contact resistance by keeping at least a current collector on one surface in such a state as freely movable horizontally in parallel with the flat surface of a plate as well as slidable on a divisional plate. CONSTITUTION: A gap is formed between electrodes 2 and 3 separated into two spaces containing an oxygen electrode 2 and different gas media of a fuel (CH4 ) and an oxygen carrier (02 ), via an airtight and conductive divisional plate 7. Also, current collectors 5 and 10 are arranged on each surface of the flat and smooth divisional plate 7 and firmly fastened to both of the oxygen electrode 21 and the fuel electrode 3. Furthermore, at least current collectors 5 and 10 on one surface are arranged so as to be freely movable horizontally in parallel with the flat surface of the plate 7 and freely slidable thereon. As a result, electrical contact and high temperature conductivity can be properly maintained, together with proper low resistance contact.

Current collector for high-temperature fuel cell

Abstract: PURPOSE: To restrict the current loss at the minimum, so as to secure the perfect transmission of current, and secure the safety of operation for a long time by forming a collector of metallic material and/or ceramic material, and forming it into the specified shape. CONSTITUTION: Collectors 3, 4 are of metallic materials and/or ceramic materials or the compound materials including metallic components and/or ceramic components, and having elasticity as a whole thereof at 800-1000 deg.C of operating temperature, and they secure multiple electrical contacts, and have a non- oxidizing characteristic at least at an oxygen side. They are formed of multiple elastic elements for forming high-temperature protecting oxides and having stability for a long time, and each collector 3, 4 is designed into a shape having spring deflection of at least 0.1mm in the condition that a load at 10 Pa is vertically applied to a flat surface of a plate. With this structure, complete transmission of the current is secured, restricting the current loss at a minimum, and while securing the safety of operation for a long time period.

Sealed battery with integral reserve cell and switch

Abstract: A sealed battery is provided with a cathode, first and second anodes which are isolated by insulation, first and second current collectors which are separated by the insulation, and an integral switch. The cathode is coupled to a positive terminal of the battery, while the first current collector is coupled to the first anode and to the negative terminal. The second current collector is also coupled to the second terminal via the switch which is easily activated by hand manipulation or by use of a common object such as a ball point pen point. The cathode, first anode, and first current collector provide a large cell. When the large cell is exhausted, as indicated by the failure of the equipment which it is powering to function properly, the reserve cell comprised of the cathode, second anode, and second current collector is readily activated by manipulating the switch. The reserve cell may be smaller than the large cell but provides enough power to properly power the equipment until the batteries can be replaced.

Current collector of ceramic fuel battery

Abstract: PURPOSE: To provide a good electrical connection at high temperature and long-life stability by forming a current collector made of the metal material, which is dispersed and hardened with a rare metal, such as Au, Pt and which exhibits the property for showing complete elasticity at the operating temperature of 900 degC CONSTITUTION: A ceramic-made high-temperature fuel cell consists of a ZrO2 - based solid electrolyte 1, an oxygen electrode 2 and a fuel electrode 3 Connection of a plurality of fuel cell components via a current collector 5 and a gas- tight conductive partition plate 4 comprises a fuel cell The current collector 5 employed with this structure uses: a material which contains or an alloy combining two or more kinds of Au, Pd, Pt and Rh, to which an oxide dispersed phase such as ThO2 , Al2 O3 , MgO, or a carbide dispersed phase such as TiC is added, and exhibiting complete elasticity at the operating temperature of 900 degC

Coated anode current collectors.

Abstract: The present invention relates to an alkaline cell having an anode current collector which is coated with a lead-containing layer containing a discontinuous dispersion of lead to effectively reduce gassing at the surface of the anode current collector during storage of the cell.

Manufacture of sheet battery

Abstract: PURPOSE:To easily manufacture a flexible sheet battery having a desirable shape in a continuous production line by coating the surface of a negative sheet with an electrolyte comprising a conductive polymer, covering with a positive material, placing a current collector thereon, then stacking packaging materials on the surfaces of the four layer structure. CONSTITUTION:A sheet thin film battery unit 10 is assembled by stacking a negative material 21 located in the lowermost layer, an electrolyte 22, a positive material 23, and a current collector 24 in order. The negative material 21 is made of a lithium or lithium-aluminium alloy foil. The electrolyte 22 is made of a solid state polymer electrolyte such as a polyethylene oxide derivative containing a lithium salt and a material mixed with carbon powder if necessary. The positive material 23 is made of a composite of vanadium oxide and polyethylene oxide derivative. The current collector is made of a nickel foil. The battery unit 10 is covered with packaging materials 12, 13.

Attractive current collector

Abstract: PURPOSE:To prevent contact loss by utilizing the attraction force, functioning between a magnet and a ferromagnetic body, for making contact with a conductor. CONSTITUTION:A magnet 12 is disposed on the contacting part with a trolley wire 2, i.e., a slider 4 or a collector shoe 11, and the attraction force, functioning with respect to the line 1 of electric vehicle including a ferromagnetic body, is utilized for making contact with the trolley wire 2 thus collecting current. Since high contact force can be obtained, contact loss can be prevented. Furthermore, since a part of contacting force functions to pull down the trolley wire 2 through the magnet 12, the trolley wire 12 is not pushed up considerably and damage on the line 1 can be suppressed.

Nonaqueous system secondary battery, manufacture thereof, and current collector for secondary battery

Abstract: PURPOSE:To increase strength of a negative electrode with performance retained by forming the negative electrode by bonding a negative active material to a current collector through a low melting point alloy. CONSTITUTION:A negative electrode 4 is formed by bonding a negative active material to a current collector 3 through a low melting point alloy 2, or by previously melt-spreading the low melting point alloy on the current collector, and pressing the negative active material against the current collector, then melting the low melting point alloy. A nonaqueous system secondary battery is fabricated in such a way that the low melting point alloy 2 melt-spreaded on the current collector 3 in the negative electrode 4 has different composition from a low melting point alloy previously melt-spreaded on the inner surface of a battery container, and the negative electrode is melt-bonded to the container through the container side low melting point alloy. The container side low melting point alloy has lower melting point than the low melting point alloy used on the current collector.

Electrode of hydrogen absorption alloy

Abstract: PURPOSE:To enhance the charging/discharging characteristics with a large current when incorporated into a secondary battery and also enhance the gas reactivity by using an electroconductive powder which consists of carbon black equipped with a certain specific surface area. CONSTITUTION:A current collector is covered with a black mix prepared by adding carbon black having a specific surface area of 700m /g or more to a powder of hydrogen absorption alloy, followed by fixing. This carbon black has a structure formed through secondary cohesion of fine carbon particles (primary particles) followed by good growth of a stereophonic chain structure, and powders of hydrogen absorption alloy one another and alloy powder and current collector are coupled electrically in good performance. This enables taking-out of large current when it is as a neg. electrode incorporated into a secondary battery, which will be equipped with an enhanced charging/ discharging characteristics with a large current and in which the powder of hydrogen absorption alloy included in the electrode is used effectively in electrical terms, so that the gas reaction speed in the event of overcharging and over-discharging will be increased.

Element arrangement for current conduction of ceramic high-temperature fuel cell

Abstract: PURPOSE: To assure good electrical contact of an electrode and an element up to 100 deg.C, and assure high conductivity and low contact resistance by arranging a current collector, tightly connected to a separating plate on both sides of the separating plate. CONSTITUTION: A fuel cell is made of a flat plate having a ZrO2 solid electrolyte 1, a La/Mn perovskite oxygen electrode 2, and a Ni/ZrO2 cermet fuel electrode 3. A fuel side current collector 5 is made of a nickel sheet, its raised part is notched by a cross grid, and has a noble metal covered layer 6 in the head, and the covered layer 6 supplies current to a current collector/fuel electrode contact region during operation. A conductive separating plate 4 is made of a super heat-resistant alloy, and the fuel side current collector 5 is connected to the separator 4 in a brazed jointing part 7. An oxygen side current collector 8 is made of a comb-shaped finger, the head of the contact finger has a noble metal covered layer 9 on the side facing the electrode 2, and the finger is connected to the separating plate 4 in the brazed jointing part 7.

AMTEC cell testing, optimization of rhodium/tungsten electrodes, and tests of other components

Abstract: Electrodes, current collectors, ceramic to metal braze seals, and metallic components exposed to the high ‘‘hot side’’ temperatures and sodium liquid and vapor environment have been tested and evaluated in laboratory cells running for hundreds of hours at 1100–1200 K. Rhodium/tungsten electrodes have been selected as the optimum electrodes based on performance parameters and durability. Current collectors have been evaluated under simulated and actual operating conditions. The microscopic effects of metal migration between electrode and current collector alloys as well as their thermal and electrical properties determined the suitability of current collector and lead materials. Braze seals suitable for long term application to AMTEC devices are being developed.

Multilayer cathode current collector/container

Abstract: A cathode current collector container (4) for use in an electrochemical cell, e.g. a Na/S cell (2) is disclosed, which includes an advantageously porous graphite first layer (44) and a molybdenum second layer (46) securely bonded to the graphite first layer (44), preferably by means of a chemical vapor deposition process. In a preferred embodiment, the cathode current collector/container (4) further includes a third layer (48) constituted of a structurally rigid, electrically conductive material, e.g. tantalum, securely bonded to the molybdenum second layer (46), preferably by means of a chemical vapor deposition process.

Current collector in high temperature rechargeable electrochemical power storage cell

Abstract: In cell 10 comprising anode compartment 56 containing a molten alkali metal anode, cathode compartment 58 containing an alkali metal aluminium halide molten salt electrolyte, and a cathode which comprises an electronically conductive electrolyte-permeable porous matrix which has dispersed therein an active cathode substance, with the matrix being impregnated with said molten electrolyte, separator 14 separating the anode compartment from the electrolyte, et least one bimetallic current connector 60 is provided in one of the cell compartments. The bimetallic current collector is such that, when the cell is at ambient temperature, the current collector is in a first non-deformed configuration. However, when the cell is at its normal operating temperature, the current collector is in a second deformed configuration. The deformation of the current collector results from the difference in co-efficients of thermal expansion of the metals making up the bimetallic current collector. The current collector in its second configuration bears against the separator 14, thereby to make electrical contact with the separator.

Thin secondary battery and manufacture thereof

Abstract: PURPOSE:To prevent the dislocation of an active material and a current collector and to increase capacity by applying a positive active material and a negative active material to each of sheet-like current collectors installed in first and second cases to form each electrode. CONSTITUTION:A thin, plane positive current collector 32 with a terminal is bonded to a case 31 and coated with a positive active material 33 by screen printing. In the same way, a negative current collector 42 is bonded to a case 41 and coated with a negative active material 43. After aging and formation of the positive electrode and the negative electrode are conducted under this condition an electrolyte 36 is closely stuck to the positive active material 33. Insulating sheets 34, 44 having openings whose shapes are the same as those of the positive active material 33 and the negative active material 43 and having smaller thickness than that of the positive current collector 32 and the negative current collector 42 are fitted, then the edges of the cases 31, 41 are sealed. Since the positive active material 33 and the negative active material 43 are applied in the same height, by this constitution, battery capacity is not limited and accurate positioning is not required. Therefore, production process can be simplified.

Fuel cell of molten carbonate

Abstract: PURPOSE:To reduce the corrosion of alloy materials used in current collectors and separators by adding strontium or calcium in carbonate of Li and K to be impregnated in an electrolytic plate. CONSTITUTION:An anode electrode 2 and a cathode electrode 3 are placed respectively over and under an electrolyte plate 1. Porous current collectors 4 and 5 are respectively placed on the outer sides of the anode electrode 2 and the cathode electrode 3. Separators 6 for forming gas passages 7 are placed respectively on the outer sides of the current collectors 4 and 5. Strontium carbonate or potassium carbonate is impregnated into lithium carbonate and potassium carbonate of the electrolyte plate 1. Corrosion of alloy materials used for the current collector and the separator is prevented with this constitution.

Current collector containing lead and having anode for alkaine battery

Abstract: PURPOSE: To reduce generation of gas from a battery during storage by limiting the lead content in an alloy of a negative electrode current collector to at least 500ppm based on the weight of the negative electrode current collector. CONSTITUTION: In a battery having a negative electrode such as zinc, a positive electrode, an alkaline electrolyte, and a conductive negative electrode current collector made of an alloy containing discontinuously dispersed lead, the content of lead in the alloy of the collector is limited to at least 500ppm based on the weight of the negative electrode current collector, and the content of lead in a copper-zinc-lead alloy is limited to at least 900ppm. The discontinuously dispersed lead means dispersion of lead into the alloy, lead contained on the surface of the negative electrode current collector does not form a continuous lead layer, and the lead region is formed on the surface. An electrochemical battery in which the generation of gas from the battery during storage is reduced or that is effectively prevented is obtained.

Sliding board for current collector

Abstract: PURPOSE:To improve followability to trolley wire, abrasion resistance, arc resistance and the like by composing the sliding board for current collector of a composite material of aluminum alloy, ceramic fibers, particles and the like. CONSTITUTION:The sliding board for current collector is composed of a composite material where one, two or more of ceramic fibers, ceramic particles and ceramic whiskers are scattered into an aluminum alloy matrix. The sliding board composed of such composite material has remarkably light weight when compared with copper or ferrous sliding board. When arc is produced, ceramic fibers exhibits framework function against scattering of fused aluminum or aluminum alloy having low melting point. Consequently, followability to trolley wire, abrasion resistance under power supply, arc resistance and the like are improved.