Abstract: A resin sealing gasket 10 to be incorporated in an alkaline battery 1 housing a power generation element (3 to 5) in a cylindrical battery can 2 closed at a bottom, the sealing gasket configured to insulate a top opening of the battery can and a negative electrode terminal plate 7 from each other. The sealing gasket includes: an outer periphery part 14 standing upward from the rim of a disc-shaped partition part 13; a boss part 11 in a hollow cylindrical shape enabling a rod-shaped negative electrode current collector 6 to stand at the center of the partition part; and a thin-walled portion 15 formed in a groove shape along the outer periphery of the boss part and being thinner than other portions of the partition part.

Abstract: A sealing gasket used in a tubular battery includes a disc-shaped partition portion; an outer peripheral portion provided to stand from a peripheral edge of the partition portion and held between an open end of a metal battery can and a dish-shaped metal sealing plate; and a plurality of stress buffer portions formed of annular grooves formed concentrically in the partition portion, wherein the tubular battery includes the metal battery can having a bottomed tubular shape and has the open end subjected to inward diameter reduction, a power generation element housed in the battery can, the dish-shaped metal sealing plate fitted and attached to the open end subjected to the inward diameter reduction, and the sealing gasket made of resin and held between the open end and the sealing plate.

Abstract: An alkaline battery and a method of producing an alkaline battery that includes a negative electrode gel in which a negative electrode active material made of a zinc alloy and a binder are dispersed in an alkaline aqueous solution. Ultrafine microfibrils form the binder.

Abstract: A resin sealing gasket 10 to be incorporated in an alkaline battery 1 housing a power generation element (3 to 5) in a cylindrical battery can 2 closed at a bottom, the sealing gasket configured to insulate a top opening of the battery can and a negative electrode terminal plate 7 from each other. The sealing gasket includes: an outer periphery part 14 standing upward from the rim of a disc-shaped partition part 13; a boss part 11 in a hollow cylindrical shape enabling a rod-shaped negative electrode current collector 6 to stand at the center of the partition part; and a thin-walled portion 15 formed in a groove shape along the outer periphery of the boss part and being thinner than other portions of the partition part.

Abstract: A battery can forming steel plate that configures an electrode can (a positive electrode can) of an alkaline battery and is to be formed into a battery can by presswork, the steel plate as a base material includes an iron and nickel diffusion layer or an iron and nickel-cobalt alloy diffusion layer that is formed by forming a nickel plated layer or a nickel-cobalt alloy plated layer with a thickness of 0.5 to 2.0 ?m on an inner surface of a battery can of a steel plate (base material steel plate) as a base material, and subsequently performing heat diffusion treatment on the nickel plated layer or the nickel-cobalt alloy plated layer. An average number of crystal grains per 0.25 mm2 unit area of the steel plate as the base material is equal to or more than 12.3.

Abstract: In a cylindrical battery including a gap formed between a peripheral side surface 32b of a dish-shaped portion in an anode terminal plate 32 and a curved end portion 11a of a cathode can 11, and a washer 50 having a cylindrical boss portion 50a and an annular flange portion 50c provided around an upper end surface of the cylindrical boss portion 50athe washer 50 being mounted to an opening portion of a cathode can 11 such that the cylindrical boss portion 50a is fitted into the gap 201, a vent structure configured to release gas released to the gap 201 from a first vent hole 32c in the anode terminal plate 32 to an exterior of the cylindrical battery (1) from an arc-shaped second vent hole (50d) formed in the flange portion(50c) or an annular gap (301, 302) formed between the upper end surface of the cylindrical boss portion (50a) and the terminal plate(32).

Abstract: As a battery can forming steel plate that configures an electrode can (a positive electrode can) of an alkaline battery and is to be formed into a battery can by presswork, the steel plate as a base material includes an iron and nickel diffusion layer or an iron and nickel-cobalt alloy diffusion layer that is formed by forming a nickel plated layer or a nickel-cobalt alloy plated layer with a thickness of 0.5 to 2.0 ?m on an inner surface of a battery can of a steel plate (base material steel plate) as a base material, and subsequently performing heat diffusion treatment on the nickel plated layer or the nickel-cobalt alloy plated layer. An average number of crystal grains per 0.25 mm2 unit area of the steel plate as the base material is equal to or more than 12.3.

Abstract: There is provided An inside-out alkaline battery, including: a cylindrical cathode can that has a bottom, that performs a function of a cathode current collector, that has a nickel-plated layer on an inner surface of the cathode can, and that has a coating on a surface layer of the nickel-plated layer, the coating being composed of nickel-cobalt alloy, a thickness of the coating being between 0.15 ?m and 0.25 ?m (both inclusive), a ratio of cobalt in the nickel-cobalt alloy being between 40% and 60% (both inclusive); and a cathode mixture that is disposed in the cathode can, that is annular in shape, and that contains a cathode active material.

Abstract: In a cylindrical battery including a gap formed between a peripheral side surface 32b of a dish-shaped portion in an anode terminal plate 32 and a curved end portion 11a of a cathode can 11, and a washer 50 having a washer boss portion 52a and an annular flange portion 50c provided around an upper end surface of the washer boss portion 52a, the washer being mounted to an opening portion of a cathode can 11 such that the washer boss portion 52a is fitted into the gap 201, a vent structure configured to release gas released to the gap 201 from a first vent hole 32a in the anode terminal plate 32 is provided in a range surrounded by a ridge line connecting a highest part 11b of the curved end portion 11a in the washer 50 and the peripheral side surface 32b of the anode terminal plate 32.

Abstract: This invention provides a battery can allowing for a reduced amount of gas forming therein, thus realizing lower production cost. The cathode can 11 of an alkaline battery is cylindrically shaped and closed-bottomed, comprising an opening 15, a body 17 and a bottom 18, with the body 17 being divided into an opening sealing section 31 and an electrode mixture container section 33 which are arranged in order from the opening 15, with the plate thickness t0 set for the electrode mixture container section 33, which is not less than 80% of the plate thickness t1 of the opening sealing section 31, with the plate thickness t3 of the electrode mixture container section 33 gradually reducing in the region starting at the topmost point of the electrode mixture container section 33 and ending at the set plate thickness t0.

Abstract: There is provided An inside-out alkaline battery, including: a cylindrical cathode can that has a bottom, that performs a function of a cathode current collector, that has a nickel-plated layer on an inner surface of the cathode can, and that has a coating on a surface layer of the nickel-plated layer, the coating being composed of nickel-cobalt alloy, a thickness of the coating being between 0.15 ?m and 0.25 ?m (both inclusive), a ratio of cobalt in the nickel-cobalt alloy being between 40% and 60% (both inclusive); and a cathode mixture that is disposed in the cathode can, that is annular in shape, and that contains a cathode active material.

Abstract: The plated steel plate for a cell can provides stable and good electrical contact on an outer surface of the cell can, and the evolution of gas within a battery can be suppressed by reducing damage to a plated surface of the steel plate when the cell can is formed by drawing press. In this manner, it is possible to provide a battery and an alkaline dry battery that can realize stable electrical contact with devices and reduce the evolution of gas. In a plated steel plate for a cell can both of whose surfaces are plated mainly with nickel, one surface of a steel plate that is a plated substrate is a dull finished surface, and another surface thereof is a bright finished surface.

Abstract: Poor contact on a terminal face that is likely to especially occur with a dry battery with low electromotive force can be appropriately inspected and suppressed. Moreover, the inspection can be highly efficiently performed in a non-contacting state. Also, a cylindrical dry battery in which the poor contact on the terminal face is certainly suppressed is provided. An apparatus 50 that inspects an electric contact at an outer surface of a positive terminal 12 and a negative terminal 32 of a dry battery 10, includes: a light-emitting section 51 that makes a light incident on a part to be measured on a terminal face of the battery; a light-receiving section 52 that detects a reflection state of the light from the part to be measured, and a measurement processing section 55 that quantifies gloss level of the part to be measured based on detection with the light-receiving section 52, wherein evaluation data of the electric contact is obtained with measurement values of the gloss level.

Abstract: This invention provides a battery can allowing for a reduced amount of gas forming therein, thus realizing lower production cost. The cathode can 11 of an alkaline battery is cylindrically shaped and closed-bottomed, comprising an opening 15, a body 17 and a bottom 18, with the body 17 being divided into an opening sealing section 31 and an electrode mixture container section 33 which are arranged in order from the opening 15, with the plate thickness t0 set for the electrode mixture container section 33,which is not less than 80% of the plate thickness t1 of the opening sealing section 31, with the plate thickness t3 of the electrode mixture container section 33 gradually reducing in the region starting at the topmost point of the electrode mixture container section 33 and ending at the set plate thickness t0.

Abstract: Poor contact on a terminal face that is likely to especially occur with a dry battery with low electromotive force can be appropriately inspected and suppressed. Moreover, the inspection can be highly efficiently performed in a non-contacting state. Also, a cylindrical dry battery in which the poor contact on the terminal face is certainly suppressed is provided. An apparatus 50 that inspects an electric contact at an outer surface of a positive terminal 12 and a negative terminal 32 of a dry battery 10, includes: a light-emitting section 51 that makes a light incident on a part to be measured on a terminal face of the battery; a light-receiving section 52 that detects a reflection state of the light from the part to be measured, and a measurement processing section 55 that quantifies gloss level of the part to be measured based on detection with the light-receiving section 52, wherein evaluation data of the electric contact is obtained with measurement values of the gloss level.

Abstract: The invention provides a plated steel plate for a cell can in which stable and good electrical contact can be provided on an outer surface of the cell can, and the evolution of gas within a battery can be suppressed by reducing damage to a plated surface of the steel plate when the cell can is formed by drawing press. In this manner, it is possible to provide a battery and an alkaline dry battery that can realize stable electrical contact with devices and reduce the evolution of gas. In a plated steel plate 110 for a cell can both of whose surfaces are plated mainly with nickel, one surface of a steel plate 111 that is a plated substrate is a dull finished surface 111a, and another surface thereof is a bright finished surface 111b.