Abstract: A nickel-metal hydride secondary battery includes: a plurality of power generating elements each having a negative plate containing hydrogen absorbing alloy; a battery case provided with partition walls and a plurality of compartments arranged adjacently on both sides of each partition wall, each of the compartments accommodating each power generating element, and the compartments allowing gas intercommunication between compartments through communication holes formed in the partition walls; and at least one of safety valves placed on the battery case, the safety valves being less in number than the number of the compartments; wherein each of the communication holes has a hole sectional area per battery module capacity in a range 0.03 to 0.30 mm2/Ah.

Abstract: To provide an electrode unit for a prismatic battery capable of increasing the output of the battery while suppressing the battery internal resistance value and improving the degree of freedom of the size of the electrode plate. An electrode unit for a prismatic battery including an electrode group in which positive electrode plates and negative electrode plates in an almost rectangular shape are alternately stacked with separators interposed therebetween. In each of the positive electrode plate and the negative electrode plate, core material exposed portions are formed at least on two side edges. The positive electrode plates and the negative electrode plate are stacked such that their core material exposed portions are directed not to overlap each other in the stack direction.

Abstract: An alkaline storage battery including a strip-shaped porous metal substrate and a material mixture filled into the substrate. The substrate has an unfilled portion where the material mixture is not filled along at least one of two longitudinal sides of the substrate. The substrate has a weight per unit area of 150 to 350 g/m2. The material mixture contains an active material and an elastic polymer.

Abstract: An alkaline storage battery including a strip-shaped porous metal substrate and a material mixture filled into the substrate. The substrate has an unfilled portion where the material mixture is not filled along at least one of two longitudinal sides of the substrate. The substrate has a weight per unit area of 150 to 350 g/m2. The material mixture contains an active material and an elastic polymer.

Abstract: A rechargeable battery reducing internal resistance and equalizing the distribution of current flow in an electrode plate assembly. A plurality of battery jars are connected to one another through partition walls. A power generation element including an electrode plate assembly, in which a cathode plate and an anode plate are stacked together with a separator arranged in between, and collector plates joined to opposite ends of the electrode plate assembly are accommodated in each battery jar. The collector plates on opposite sides of the partition wall formed between two adjacent battery jars are connected to each other. Connection holes are formed in the partition wall at a plurality of locations. Connection projections, which project from the collector plates, are fitted into the connection holes and welded. The connection projections have distal ends that are in contact with each other.

Abstract: A battery having a collecting structure that can reduce internal resistance of the battery and a structure that allows easy manufacturing of the battery by the following processes is provided. An enlarged portion is formed near an opening end of a battery case and a supporting ledge is provided on the inner surface of the lower end of the enlarged portion. A collector of one polarity is bonded to an electrode plate group. A connection lead is bonded to the collector at one end and is bonded to a lower surface of a sealing member at the other end. An insulation gasket is mounted to a peripheral edge portion of the sealing member from a side opposite to the collector. The peripheral edge portion of the sealing member is supported by the supporting ledge with the insulation gasket interposed therebetween.

Abstract: An alkaline storage battery including a strip-shaped porous metal substrate and a material mixture filled into the substrate. The substrate has an unfilled portion where the material mixture is not filled along at least one of two longitudinal sides of the substrate. The substrate has a weight per unit area of 150 to 350 g/m2. The material mixture contains an active material and an elastic polymer.

Abstract: A nickel-metal hydride secondary battery includes: a plurality of power generating elements each having a negative plate containing hydrogen absorbing alloy; a battery case provided with partition walls and a plurality of compartments arranged adjacently on both sides of each partition wall, each of the compartments accommodating each power generating element, and the compartments allowing gas intercommunication between compartments through communication holes formed in the partition walls; and at least one of safety valves placed on the battery case, the safety valves being less in number than the number of the compartments; wherein each of the communication holes has a hole sectional area per battery module capacity in a range 0.03 to 0.30 mm2/Ah.

Abstract: A battery having a coiled electrode plate assembly housed in a case that efficiently utilizes the space available in portable electronic appliances is provided. The battery case 1 has a head portion 1a having a circular cross section and a body portion 1b having a substantially square cross section, one side of which is equal to or longer than the diameter of the circular cross section of the head portion.

Abstract: A battery having a collecting structure that can reduce internal resistance of the battery and a structure that allows easy manufacturing of the battery by the following processes is provided. An enlarged portion is formed near an opening end of a battery case and a supporting ledge is provided on the inner surface of the lower end of the enlarged portion. A collector of one polarity is bonded to an electrode plate group. A connection lead is bonded to the collector at one end and is bonded to a lower surface of a sealing member at the other end. An insulation gasket is mounted to a peripheral edge portion of the sealing member from a side opposite to the collector. The peripheral edge portion of the sealing member is supported by the supporting ledge with the insulation gasket interposed therebetween.

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 rechargeable battery reducing internal resistance and equalizing the distribution of current flow in an electrode plate assembly. A plurality of battery jars are connected to one another through partition walls. A power generation element including an electrode plate assembly, in which a cathode plate and an anode plate are stacked together with a separator arranged in between, and collector plates joined to opposite ends of the electrode plate assembly are accommodated in each battery jar. The collector plates on opposite sides of the partition wall formed between two adjacent battery jars are connected to each other. Connection holes are formed in the partition wall at a plurality of locations. Connection projections, which project from the collector plates, are fitted into the connection holes and welded. The connection projections have distal ends that are in contact with each other.

Abstract: To provide an electrode unit for a prismatic battery capable of increasing the output of the battery while suppressing the battery internal resistance value and improving the degree of freedom of the size of the electrode plate. An electrode unit for a prismatic battery including an electrode group in which positive electrode plates and negative electrode plates in an almost rectangular shape are alternately stacked with separators interposed therebetween. In each of the positive electrode plate and the negative electrode plate, core material exposed portions are formed at least on two side edges. The positive electrode plates and the negative electrode plate are stacked such that their core material exposed portions are directed not to overlap each other in the stack direction.

Abstract: A rechargeable battery for eliminating the need for attaching a joining metal member to a collector plate, while lowering the cost for forming collector plates and lowering resistance in the collector plate and in a joining portion. The rechargeable battery includes an electrode plate group formed by alternately superimposing positive electrode plates having positive electrode plate collector portions and negative electrode plates having negative electrode plate collector portions with separators arranged therebetween. Collector plates, formed by metal plates, are joined to the corresponding positive and negative electrode plate collector portions. Each collector plate is bent at a predetermined portion to form a joining portion having a ridge-shaped cross-section. The joining portion of each collector plate is pressed into the edge of the corresponding electrode plate collector portion and joined to the electrode plate collector portion by performing resistance welding.

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 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: An alkaline storage battery including a strip-shaped porous metal substrate and a material mixture filled into the substrate. The substrate has an unfilled portion where the material mixture is not filled along at least one of two longitudinal sides of the substrate. The substrate has a weight per unit area of 150 to 350 g/m2. The material mixture contains an active material and an elastic polymer.

Abstract: A battery having a collecting structure that can reduce internal resistance of the battery and a structure that allows easy manufacturing of the battery by the following processes is provided. An enlarged portion is formed near an opening end of a battery case and a supporting ledge is provided on the inner surface of the lower end of the enlarged portion. A collector of one polarity is bonded to an electrode plate group. A connection lead is bonded to the collector at one end and is bonded to a lower surface of a sealing member at the other end. An insulation gasket is mounted to a peripheral edge portion of the sealing member from a side opposite to the collector. The peripheral edge portion of the sealing member is supported by the supporting ledge with the insulation gasket interposed therebetween.

Abstract: A battery which realizes high power output, cost reduction and increase in capacity. An enlarged port section is formed in an open end of a battery case. A ring-shaped support rack section is formed inside of the enlarged port section, and a ring-shaped insulating gasket is set on and supported by the support rack section. The battery has a collector of one pole, to which an end portion of an electrode plate of one pole protruding from an electrode plate group is connected. A ring and flange-shaped collar section, which is tiered with a step, is provided in the periphery of the collector, and the flange-shaped collar section is set on the bottom face of the insulating gasket. A port sealing member, in which a filter section and a cap-shaped terminal section are integrated with each other, is connected onto the collector.

Abstract: The present invention relates to a battery using a case of which the section of the lower part containing an electric element is square or hexagonal and the section of the upper part containing a sealing plate is circular or elliptic. By virtue of the shape of the lower part the space efficiency of the battery pack is enhanced and by virtue of the shape of the upper part the productivity of the battery is improved. Further, preferably, the corners of the lower part of the case are rounded or chamferred, whereby the temperature rise in the battery pack is suppressed.