Abstract: A battery pack comprises: a battery unit (12) including a plurality of batteries (1) arranged flatly and electrically connected with one another by either series or parallel connection, or a combination thereof; a pair of heat transfer plates (8a, 8b) made of a material exhibiting excellent thermal conductivity and arranged in parallel to a surface where the battery unit (12) is arranged, of which one makes surface contact with a top-surface side of each of the batteries (1) of the battery unit (12), and the other makes surface contact with a back-surface side of each of the batteries (1) of the battery unit (12); and a housing (2) made of a material exhibiting excellent thermal conductivity, the housing accommodating the battery unit (12) and the pair of heat transfer plates (8a, 8b) and making surface contact with the pair of heat transfer plates (8a, 8b).

Abstract: A battery case (1, 8), substantially square in cross section, has four lateral walls (5, 6) each of which is gradually arc-shaped to expand outwardly with a radius of curvature R1. The cross section is adapted to satisfy equation R1/r=4 to 20, where r is the distance between a midpoint (C2) of each lateral wall (5, 6) and the center point (C1) in the cross section of the battery case (1, 8) and R1 is the radius of curvature. In addition, the battery case (8) is rounded at each corner with a radius of curvature of R2, and has a cross section that satisfies equation R2/r=0.3 to 0.8, where r is the distance between the midpoint (C2) of each lateral wall (6) and the center point (C1) in the cross section of the battery case (8) and R2 is the radius of curvature of each corner.

Abstract: A prismatic battery with tabless current collectors. Electrode plates are wound to have a rectangular or elliptic cross section, and current collectors formed of metal plates having a shape conforming to this cross section are welded to the end faces of the belt-shaped current collecting portions of the electrode assembly. The metal plate includes a pair of lengthwise notches and a pair of widthwise notches respectively extending from the center to the periphery, and the opposing side edges of these notches protrude orthogonally from the metal plate to form connection pieces, which are welded to the belt-shaped current collecting portions of the electrode assembly.

Abstract: After accommodating an electrode group in a battery case having a substantially square transverse cross section, making an opening head of the battery case into a cylindrical shape through compression molding, an annular groove is formed by pressing a groove-forming roller sideways against a side surface of the opening head while rotating the battery case with a pressing force being kept applied to the battery case in an axial direction from the opening portion side, or alternatively pressing the groove-forming roller against the opening head from the side surface thereof and concurrently displacing the groove-forming roller in a direction toward the opening portion of the battery case while rotating the battery case. After having an annular supporting portion that bulges inward of the battery case support an opening-sealing member, the opening-sealing member is fixed through caulking by bending the opening end portion of the battery case inward, whereby a battery is manufactured.

Abstract: A battery case (1, 8), substantially square in cross section, has four lateral walls (5, 6) each of which is gradually arc-shaped to expand outwardly with a radius of curvature R1. The cross section is adapted to satisfy equation R1/r=4 to 20, where r is the distance between a midpoint (C2) of each lateral wall (5, 6) and the center point (C1) in the cross section of the battery case (1, 8) and R1 is the radius of curvature. In addition, the battery case (8) is rounded at each corner with a radius of curvature of R2, and has a cross section that satisfies equation R2/r=0.3 to 0.8, where r is the distance between the midpoint (C2) of each lateral wall (6) and the center point (C1) in the cross section of the battery case (8) and R2 is the radius of curvature of each corner.

Abstract: A battery pack comprises: a battery unit (12) including a plurality of batteries (1) arranged flatly and electrically connected with one another by either series or parallel connection, or a combination thereof; a pair of heat transfer plates (8a, 8b) made of a material exhibiting excellent thermal conductivity and arranged in parallel to a surface where the battery unit (12) is arranged, of which one makes surface contact with a top-surface side of each of the batteries (1) of the battery unit (12), and the other makes surface contact with a back-surface side of each of the batteries (1) of the battery unit (12); and a housing (2) made of a material exhibiting excellent thermal conductivity, the housing accommodating the battery unit (12) and the pair of heat transfer plates (8a, 8b) and making surface contact with the pair of heat transfer plates (8a, 8b).

Abstract: An alkaline storage battery using positive electrodes comprising an active material containing nickel hydroxide particles and a rare earth element or a compound thereof containing or mixed with 0.1-100 ppm of Fe or an Fe compound based on the rare earth element or the compound thereof is provided.

Abstract: A nickel-metal hydride secondary battery includes positive electrodes including nickel hydroxide, negative electrodes including a hydrogen-absorbing alloy, separators and an alkaline electrolyte. The positive electrode includes a compound silicate. By employing the above construction, the compound silicate reacts with Mn or Al which dissolves out from the negative electrode to inhibit deterioration of electrochemical characteristics of the battery, and thus the life of the battery can be prolonged.

Abstract: A nickel metal hydride storage battery having an excellent charging efficiency at high temperatures is provided by using a positive electrode comprising nickel hydroxide particles and at least one rare earth compound obtainable by treating a rare earth oxide with an aqueous alkaline solution and an oxidizing agent.

Abstract: A alkaline storage battery using positive electrodes comprising an active material containing nickel hydroxide particles and a rare earth element or a compound thereof containing or mixed with 0.1-100 ppm of Fe or an Fe compound based on the rare earth element or the compound thereof is provided.

Abstract: A method for managing a back-up power source capable of maintaining the discharge capacity of a nickel metal-hydride storage battery for a long-term at a low cost, and is suitable for the management of the back-up power source for the guidance lights, the emergency lights, the information telecommunication systems, and the like is disclosed.