Abstract: A main object of the present disclosure is to provide a method for producing a layered battery with which a layered battery with high structural reliability can be produced.

Abstract: The charge-discharge control device includes an alternating current-direct current converter that converts AC power from a primary side into DC power, a direct current bus that distributes power from the alternating current-direct current converter, a plurality of channels connected in parallel to the direct current bus, and a processor configured to control a current of charging or discharging of a secondary battery connected to the channel so as to minimize power supplied from the primary side.

Abstract: The present invention adopts a microbial preparation production method comprising: a step for mixing crushed waste gypsum with a culture medium containing microorganisms to obtain a mixed liquid; and a step for culturing the mixed liquid. The particle diameter of the crushed waste gypsum is at most 30 mm.

Abstract: In a method for adjusting a device voltage of a power storage device, when this device is represented as an equivalent circuit in which a parallel circuit of a capacitive device component and a short-circuit resistance indicating a magnitude of self-discharge of the device component is connected in series with a DC resistance of the power storage device, the power storage device has a property that, while the power storage device is pressed under a load and the device component is charged to generate a component voltage, the component voltage lowers when the load is reduced, but rises when the load is increased. The method includes a) component-voltage changing by load change of changing the load applied to the power storage device under a first load, generating a first component voltage in the device component, from the first load to change the component voltage from the first component voltage.

Abstract: A self-discharge inspection method for a power storage device having a property that while the power storage device is pressed under a first load and charged with a first device voltage, in which a device voltage decreases when a load is reduced from the first load, includes detecting the first device voltage of the power storage device pressed under the first load and charged, continuously applying a power-supply voltage equal to the first device voltage from an external power supply, detecting a power-supply current flowing to the power storage device, determining a self-discharge state of the power storage device based on the detected power-supply current, and reducing the load applied to the power storage device from the first load by a load reduction amount before the power-supply current stabilizes after start of the voltage continuously applying.

Abstract: The battery inspection method includes the following. Self-discharging the battery to be inspected until a predetermined time elapses from the start of self-discharging. Detecting a voltage, a current, a temperature of the battery and an ambient temperature when the predetermined time elapses. Perform a preliminary step prior to self-discharge of the battery. Obtain preliminary step information representing the execution conditions of the preliminary step. Calculating the current convergence value from the acquired preliminary step information, the detected voltage, current, and temperature, and the detected ambient temperature by referring to a predetermined correspondence between the preliminary step information, the voltage, current, and temperature of the battery at the time when the predetermined time elapses, the ambient temperature, and the current convergence value. Determining whether a short circuit failure of the battery has occurred based on the calculated current convergence value.

Abstract: A method of manufacturing a power storage module includes a preparation process of preparing at least one power storage cell each having a pouring port, a fixing process of attaching and fixing a sealing member to a pouring member, a measurement process of measuring the shape of the sealing member, a pressure reduction process of reducing the pressure in the power storage cell, a re-measuring process of measuring the shape of the sealing member again after the pressure reduction process, and a determination process of calculating the displacement amount of the sealing member based on a measurement result in the measurement process and a measurement result in the re-measuring process, and determining that the internal pressure of the power storage cell is appropriate when the displacement amount is equal to or greater than a reference value.

Abstract: In a method for inspecting the insulation property of a secondary battery by connecting an external DC power supply to the secondary battery charged with an initial charge amount and evaluating the insulation property of the secondary battery based on a converging state of a power-supply current, when a charge amount at which an inclination of a tangent to a charge amount—battery voltage curve representing a relationship between the charge amount and a battery voltage of the secondary battery is smallest is assumed as a minimum-inclination charge amount, and the inclination of the tangent at the minimum-inclination charge amount is assumed as a minimum inclination (?L), the initial charge amount is selected from a range of the charge amount in which the inclination is two or more times the minimum inclination.

Abstract: Provided is technology which can prevent breakage of a collector in a battery using an electrode sheet including an uncoated part with a narrowed width. A battery includes a collector bundle including an uncoated part stacked in a plurality of layers formed at each side edge in the width direction of the electrode body. A junction part including compressed uncoated part in plural layers is formed at an outer end in the width direction of the collector bundle. A converging part including the collector in plural layers converging so that the surface is inclined toward the junction part is formed inside in the width direction. The foil collecting angle of the collector bundle is 120° or more and 160° or less, and an R part with a curvature radius of 0.3 mm or more is formed at the converging part side end of the junction surface of the collector terminal.

Abstract: A lithium ion secondary battery includes a positive electrode and a negative electrode in which a positive-to-negative electrode capacity ratio between a positive capacity of the positive electrode and a negative capacity of the negative electrode is in a range of 1.02 to 1.40, and a negative electrode irreversible capacity of the negative electrode is larger than a positive electrode irreversible capacity of the positive electrode.

Abstract: A self-discharge inspection method for a power storage device having a property that while the power storage device is pressed under a first load and charged with a first device voltage, in which a device voltage decreases when a load is reduced from the first load, includes detecting the first device voltage of the power storage device pressed under the first load and charged, continuously applying a power-supply voltage equal to the first device voltage from an external power supply, detecting a power-supply current flowing to the power storage device, determining a self-discharge state of the power storage device based on the detected power-supply current, and reducing the load applied to the power storage device from the first load by a load reduction amount before the power-supply current stabilizes after start of the voltage continuously applying.

Abstract: In a method for adjusting a device voltage of a power storage device, when this device is represented as an equivalent circuit in which a parallel circuit of a capacitive device component and a short-circuit resistance indicating a magnitude of self-discharge of the device component is connected in series with a DC resistance of the power storage device, the power storage device has a property that, while the power storage device is pressed under a load and the device component is charged to generate a component voltage, the component voltage lowers when the load is reduced, but rises when the load is increased. The method includes a) component-voltage changing by load change of changing the load applied to the power storage device under a first load, generating a first component voltage in the device component, from the first load to change the component voltage from the first component voltage.

Abstract: In a method for inspecting the insulation property of a secondary battery by connecting an external DC power supply to the secondary battery charged with an initial charge amount and evaluating the insulation property of the secondary battery based on a converging state of a power-supply current, when a charge amount at which an inclination of a tangent to a charge amount—battery voltage curve representing a relationship between the charge amount and a battery voltage of the secondary battery is smallest is assumed as a minimum-inclination charge amount, and the inclination of the tangent at the minimum-inclination charge amount is assumed as a minimum inclination (?L), the initial charge amount is selected from a range of the charge amount in which the inclination is two or more times the minimum inclination.

Abstract: An assembly device for a battery component proposed herein includes at least one of members that are a positioning pin and a chuck, and a suction machine. There is at least one exhaust passage inside the at least one of the members that are the positioning pin and the chuck. An outer peripheral surface of the at least one of the members that are the positioning pin and the chuck has at least one dust-collecting port to which the at least one exhaust passage opens. The at least one exhaust passage is connected to the suction machine.

Abstract: Provided is technology which can prevent breakage of a collector in a battery using an electrode sheet including an uncoated part with a narrowed width. A battery includes a collector bundle including an uncoated part stacked in a plurality of layers formed at each side edge in the width direction of the electrode body. A junction part including compressed uncoated part in plural layers is formed at an outer end in the width direction of the collector bundle. A converging part including the collector in plural layers converging so that the surface is inclined toward the junction part is formed inside in the width direction. The foil collecting angle of the collector bundle is 120° or more and 160° or less, and an R part with a curvature radius of 0.3 mm or more is formed at the converging part side end of the junction surface of the collector terminal.

Abstract: An battery assembly includes: a holder having a front surface and a back surface and having a plurality of holding holes, which are cylindrical holes penetrating through between the front surface and the back surfaces; and a cylindrical battery extending in an axis direction and having an outside diameter smaller than an inside diameter of the holding hole, wherein: the holder is configured such that at least part of the battery is accommodated in the holding hole; the battery assembly includes an adhesive provided between an outer peripheral surface of the part of the battery and an inner peripheral surface of the holder so as to fix the battery to the holder; and the holder has grooves each of which is opened on the front surface or the back surface of the holder, each of the grooves making adjacent holding holes among the plurality of holding holes with each other.

Abstract: When a temperature inside a secondary battery becomes high and a gas pressure inside a battery case increases, an inversion plate is pressed due to the gas pressure so as to project and curve in a projecting manner toward an external terminal board. Due to such a deformation, a load is transmitted to a current interruption piece via a load transmission portion. At this time, due to a pushing-up force of the load transmission portion, a vulnerable breaking portion forming part of a peripheral edge of the current interruption piece breaks, so that the current interruption piece is displaced to bend in a V-shape via a folding portion. As a result, the secondary battery is brought into an unusable state. Such a configuration can attain simplification of a structure to interrupt a current.

Abstract: An assembly device for a battery component proposed herein includes at least one of members that are a positioning pin and a chuck, and a suction machine. There is at least one exhaust passage inside the at least one of the members that are the positioning pin and the chuck. An outer peripheral surface of the at least one of the members that are the positioning pin and the chuck has at least one dust-collecting port to which the at least one exhaust passage opens. The at least one exhaust passage is connected to the suction machine.

Abstract: An assembly device for a battery component proposed herein includes at least one of members that are a positioning pin and a chuck. There is at least one exhaust passage inside the at least one of the members that are the positioning pin and the chuck. An outer peripheral surface of the at least one of the members that are the positioning pin and the chuck has at least one dust-collecting port to which the at least one exhaust passage opens. The at least one exhaust passage is connected to a suction machine.

Abstract: A region of a hole-inner circumferential surface composing a portion defining a terminal through-hole, the region being located on the battery case cover side, include a tapered surface gradually enlarged in diameter as extending toward the battery case cover side and opening toward the battery case cover side; when riveting is carried out, a region of a shaft portion, the region being located inward of the tapered surface, is enlarged in diameter so as to form an annular projecting portion in contact with the tapered surface; and a hole circumferential portion located around the portion defining the terminal through-hole is held between the external enlarged-diameter portion and the annular projecting portion so as to fix a first terminal member to a second terminal member.