Abstract:
An electric storage device management system includes a voltage sensor configured to detect a voltage across an electric storage device having a correlation between an open circuit voltage (OCV) and a state of charge (SOC), the correlation including a slight change region and a sharp change region, the slight change region being a region in which a variation in OCV relative to the SOC is equal to or smaller than a reference value, and the sharp change region being a region in which the variation is larger than the reference value.
Abstract:
Provided is a water addition plug for a storage battery, which is for carrying out water addition into a container of the storage battery. The water addition plug comprising a water addition plug main body having a water supply port through which the water is supplied, a water addition port through which the supplied water is discharged into the container, and a valve chest disposed between the water supply port and the water addition port and provided with a first valve and a second valve and a float that moves up and down following an electrolyte level in the container. The first valve comprises a first drain port, which is open to the valve chest and communicates with the water addition port, and a first valve element for closing the first drain port in synchronization with a vertical movement of the float. The second valve comprises a second drain port, which is open to the valve chest and communicates with the water addition port, and a second valve element for closing the second drain port.
Abstract:
A state of charge estimation device for estimating a state of charge of iron phosphate lithium ion batteries includes a voltage measurement component configured to measure a voltage across the iron phosphate lithium ion batteries, a current measurement component configured to measure a current flowing through the iron phosphate lithium ion batteries, and a controller component configured to, when an estimation of the state of charge of the iron phosphate lithium ion batteries based on an accumulated amount of currents measured by the current measurement component is defined as a current accumulation method and an estimation of the state of charge of the iron phosphate lithium ion batteries based on an open circuit voltage (OCV) of the iron phosphate lithium ion batteries measured by the voltage measurement component is defined as an OCV method, permit the estimation of the state of charge by the OCV method.
Abstract:
An electric storage device includes a negative electrode, a positive electrode, and a separator interposed between the negative electrode and the positive electrode, the negative electrode including a negative electrode layer including an active material including an amorphous carbon particle capable of occluding and releasing at least one of an alkali metal and an alkaline earth metal, and a binder. The negative electrode layer includes a plurality of pores, and a ratio S1/S2 of a specific surface area (S1) of micropores having a pore diameter of 1 nm or more and 3 nm or less in the pores to a specific surface area (S2) of mesopores having a pore diameter of 20 nm or more and 100 nm or less therein is 0.3 or more and 0.9 or less.
Abstract:
A positive electrode material for an alkaline storage battery includes nickel hydroxide. Zn and an A element are held in solid solution in a crystallite of the nickel hydroxide, the A element being at least one element selected from the group consisting of Al, Ga, Mn, and Mo. The content of the A element, [A]/([Ni]+[A]+[Zn]), is 5 to 16% (where [A] represents the molarity of the A element,[Ni] represents the molarity of nickel, and [Zn] represents the molarity of zinc in the crystallite). [Zn]/([Ni]+[A]+[Zn]) is 1 to 10%. The nickel hydroxide includes α-phase nickel hydroxide and β-phase nickel hydroxide.
Abstract:
A switch failure detection device configured to be installed in an electric system including an electric storage device, the switch failure detection device including at least one electronic switch to be connected in a path in which a charging current to the electric storage device and a discharging current from the electric storage device flow, the at least one electronic switch including a first electronic switch, at least one rectifier for passing a discharging current by bypassing the electronic switch when the electronic switch is turned off, the at least one rectifier including a first rectifier being connected parallel to or being parasitic to the first electronic switch such that a forward direction thereof corresponds to a direction in which the discharging current flows, a switch voltage detection circuit configured to detect a voltage drop caused by the at least one electronic switch, and a controller.
Abstract:
A volume Ve of an electrode group thereof is calculated by Ve=(Sp+Sn)×D/2, where Sp represents an electrode plate area of a positive electrode plate, Sn represents an electrode plate area of a negative electrode plate, D represents the internal dimension of a container in the direction in which the electrode plates of the electrode group are laminated. A ratio (Vp+Vn)/Ve is 0.27 to 0.32, where Vp+Vn is the sum volume of the total pore volume Vp of a positive active material and the total pore volume Vn of the negative active material contained in the electrode group, and Ve is the volume of the electrode group. A ratio Vp/Ve is 0.13 to 0.15, where Vp is the total pore volume of the positive active material and Ve is the volume of the electrode group.
Abstract:
A non-aqueous electrolyte secondary battery includes: a container; an electrode assembly; an electrode terminal; a current collector; and an internal insulation sealing member insulating the container and the current collector. The container includes a wall having an outer surface with a protrusion part protruding outward from the outer surface and an inner surface with a recess part formed correspondingly in position to the protrusion part. The recess part has an outermost bottom surface and an inner side surface formed continuously between the bottom surface and the inner surface of the wall of the container. At least part of the inner side surface of the recess part is tilted to the protrusion direction of the protrusion part. The internal insulation sealing member is between the current collector and the recess part of the container, and has side wall parts parallel to the at least part of the inner side surface.
Abstract:
An energy storage device includes: a flattened electrode assembly formed by winding electrodes such that a hollow portion is formed, the electrode assembly including a pair of curved portions opposed manner in a major axis direction and a pair of flat portions opposed in a minor axis direction; and a case storing the electrode assembly therein, wherein assuming a thickness of the flat portion in the minor axis direction as A, a thickness of the curved portion in a radial direction as B, and a thickness of the hollow portion in the minor axis direction as W, the electrode assembly satisfies A+(W/2)≦B in a state where the electrode assembly is discharged.