Abstract: A sealed and prismatic storage battery characterized by such features as a high volumetric energy density, high compressivity and the like is provided. A battery case has an inner surface and an outer surface of each respective corner section formed of a curvature. The thickness of the corner section is 2.5 mm, a radius of curvature of the outer surface is 5.0 mm, a radius of curvature of the inner surface is 2.5 mm, and a thickness of a small thickness section between the corner section and the flat plane section is 2.0 mm. The position of the thinnest wall section coincides with a position where the radius of a circular arc forming the inner surface of the corner section crosses perpendicularly the outer side surface of the battery case.

Abstract: A sealed alkaline storage battery with a long cycle life is disclosed, in which an inadequate adjustment between some of the electrode plates in a cell and the difference in the deterioration resulting from the difference in the heat dissipating abilities of the plates in the cell has been obviated. The storage battery comprises an electrode group configured by piling up a plurality of positive electrodes and a plurality of negative electrodes alternately with separators interposed therebetween, wherein the capacities of the respective negative electrodes are larger than those of the adjacent positive electrodes, except for the negative electrodes positioned at both ends of the electrode group. The capacities of the positive electrodes and the negative electrodes in the central part of the electrode group are larger than those of the positive electrodes and the negative electrodes located closer to both ends of the electrode group.

Abstract: A cell for sealed nickel-metal hydride storage battery having a high energy density and a long cycle life is disclosed. It comprises a battery casing made of a synthetic resin which accommodates a power-generating unit including a hydrogen storage alloy negative electrode whose hydrogen equilibrium pressure is 0.01-0.1 MPa at 45.degree. C., when H/M=0.5, and a lid for sealing an open end of the casing provided with a safety vent whose operation pressure is 0.2-0.8 MPa. A pressure-resistant strength of the battery casing is in a range of 0.7-2.0 MPa and set higher than the operation pressure of the safety vent by 0.5 MPa or more.

Abstract: An improved non-sintered type nickel positive electrode comprising a nickel hydroxide powder as an active material and a cobalt hydroxide powder for improving the utilization of the active material, and an alkaline storage battery configured with the positive electrode are disclosed. In the non-sintered type nickel positive electrode, at least part of the surfaces of the particles of the cobalt hydroxide powder is covered with a stabilizing agent of at least one member selected from the group consisting of a higher carboxylic acid, an ester of carboxylic acid, an aldehyde, a phenol and a vitamin.

Abstract: The present invention relates to an alkaline secondary battery improved in the structure of the plate substrate, and provides an alkaline secondary battery which uses a three-dimensional porous substrate which is inexpensive, improved in stability in electrolyte and inhibited from shrinkage at sintering. The battery has such a construction comprising a sealed case containing positive electrodes mainly composed of a nickel oxide, negative electrodes mainly composed of a hydrogen-absorbing alloy or a cadmium oxide, an alkaline electrolyte containing at least one component selected from the group consisting of potassium hydroxide, lithium hydroxide and sodium hydroxide and separators, the substrate used for at least one of the positive electrode and the negative electrode being a three-dimensional porous iron sintered body on the surface of which is provided a nickel coating layer.

Abstract: A relatively large rectangular sealed alkaline storage battery used for electric cars, etc. is disclosed. The battery has such an inner construction as to inhibit deformation of the electrode group caused by charging and discharging so as to improve the life characteristics. The electrode group comprises positive electrode plates alternating with negative electrode plates in a planar direction and separators between the adjacent electrode plates. The electrode group and an alkali electrolyte are inserted in a container, which is sealed by a cover provided with a safety vent and the position of the electrode group in the container is controlled by fixing poles to the cover. The amount of the alkali electrolyte is 1.5-2.5 cm.sup.3/ battery capacity 1 Ah. Especially, for a module battery, a given distance is provided between the shorter side face of the electrode group and the inner wall of the container, and the outer longer side faces of the container are constrained by a metallic plate.

Abstract: The present invention provides a unit battery of sealed alkaline storage battery comprising a plurality of cells each of which comprises a container in which are inserted an alkali electrolyte and an electrode group comprising a plurality of positive plates and a plurality of negative plates with separators provided between the adjacent plates and which is sealed by a cap provided with a safety valve, the adjacent cells being electrically connected, wherein at least a part of the outermost portion of the electrode group in the cell contacts with the container, the adjacent cells contact with each other at at least a part of their container and a space through which air can pass in at least one direction is provided between the adjacent cells, the unit battery being constrained by holders at a part or the whole surface of both ends in the direction of arranging of the cells.

Abstract: A nickel positive electrode for an alkaline storage battery includes an active material mixture and a conductive support. The active material mixture, which is composed mainly of nickel hydroxide, additionally contains nickel powder, a second powder compound and at least one of cobalt, cobalt hydroxide and cobalt oxide. The nickel powder has a specific surface area of from 0.1 to 3 m.sup.2 /g and an average particle diameter of from 0.1 to 15 micrometers, and the second powder compound contains at least one element including Ca, Sr, Ba, Cu, Ag or Y. A sealed nickel-hydrogen storage battery may incorporate the nickel positive electrode.

Abstract: A sealed storage battery for use in potable power supply is improved by using metal oxide-hydrogen storage alloy to have a higher capacity and a smaller weight. The battery has a structure which comprises a combination of a positive electrode having a high energy density in a wide range of temperature and consisting of a bulk high porosity body filled with an active material composed of solid solutions such as typical Co solid solution, oxide powders such as typically Ca(OH).sub.2 and ZnO, with an addition of graphite for rendering the electrode reaction effective; and a high capacity negative electrode of hydrogen storage alloy having a reduced equilibrium hydrogen pressure, and where the aforementioned characteristics at high temperatures are further enhanced by an electrolyte suitable to high temperatures, short-circuits are prevented by a chemically stable separator, and a structure sealing a container and a safety vent is excellent in air-tightness and reliability.

Abstract: A nickel positive electrode for an alkaline storage battery comprises an active material mixture mainly composed of nickel hydroxide and a conductive support. The active material mixture contains at least one member selected from the group consisting of cobalt, cobalt hydroxide and cobalt oxide, and carbon powder having a lattice constant "d" of a (002) plane such that 3.35 .ANG.<d.ltoreq.3.45 .ANG..