Abstract: An energy storage device, includes a terminal; an electrode assembly having a body portion and a tab portion projecting from the body portion; and a current collector electrically connecting the terminal and the tab portion with each other. The current collector is configured such that a plate portion and a second plate portion which opposedly face each other are continuously formed with each other with curved portion interposed therebetween, and a thickness of the curved portion is set smaller than a thickness of the first plate portion and a thickness of the second plate portion.

Abstract: This abnormal factor determination device is provided with a measured value acquisition unit which acquires measured values including electric values and temperature values of multiple power storage elements, a predicted value acquisition unit which acquires predicted values including electric values and temperature values of multiple power storage elements, and a determination unit which, on the basis of the acquired measured values and predicted values, determines whether or not there are abnormal factors in the power storage system.

Abstract: A first projecting portion is disposed between a head portion of an external terminal and a gasket body of a gasket, the first projecting portion projecting toward the gasket body from a first opposedly-facing surface which opposedly faces a case of the head portion, the first projecting portion surrounding the shaft portion, the first projecting portion having a pressing surface which directly or indirectly presses the gasket body in a projecting direction of the first projecting portion. The gasket has the second and third opposedly-facing surfaces, the second opposedly-facing surface opposedly facing the head portion, the third opposedly-facing surface opposedly facing the case.

Abstract: An energy storage apparatus includes: an energy storage device which includes an electrode terminal; an outer case; and an external connection terminal. The external connection terminal includes: an external connection part to be connected to an external conductive member; a circuit breaking part; and a bus bar which connects the electrode terminal or the external connection part with the circuit breaking part, and which is formed in the outer case by insert molding. The bus bar includes an outer exposed portion on which the circuit breaking part is detachably mounted from the outside of the outer case.

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.

Abstract: An SOC estimation device 50 of an energy storage device includes a storage unit 73 and a data processing unit 71. The energy storage device 100 has a characteristic including a first deterioration mode in which a capacity drop with respect to time indicates a first transition, and a second deterioration mode in which a capacity drop indicates a second transition. The storage unit 73 holds first correlation data M1 indicating a correlation between SOC and OCV of the energy storage device in the first deterioration mode, and second correlation data M2 indicating a correlation between SOC and OCV of the energy storage device in the second deterioration mode. The data processing unit 71 executes a mode determination process of determining a deterioration mode of the energy storage device, and an estimation process of selecting correlation data corresponding to the deterioration mode from the storage unit, to estimate SOC of the energy storage device.

Abstract: Provided is a management device (BMS 40) for an assembled battery 30 which uses a positive electrode active material containing lithium iron phosphate and having an electrically conductive layer formed on a surface thereof, the BMS 40 being provided with: a current sensor 43 which measures a current flowing through the assembled battery 30; a voltage sensor 45 which measures a voltage of the assembled battery 30; and a management unit 42.

Abstract: An electric storage device includes: an electrode assembly including a positive electrode plate and a negative electrode plate that are insulated from each other; a pair of current collectors each of which includes a connecting portion and is connected to a corresponding one of the positive electrode plate and the negative electrode plate at the connecting portion; a case that houses the electrode assembly and the pair of current collectors, the electrode assembly being supported by the pair of current collectors in the case; and a distance retaining member that retains a distance between portions more distal than the respective connecting portions of the pair of current collectors.

Abstract: A charge voltage controller for a chargeable and dischargeable energy storage device including an electrode assembly having a positive electrode and a negative electrode, is configured to control upper limit voltage applied to charge the energy storage device in accordance with at least one of charge time of the energy storage device, current inputted to the energy storage device, temperature of the energy storage device, and a state of charge of the energy storage device, to inhibit potential of the negative electrode from being lower than deposition potential at which metal ions transmitting and receiving an electric charge between the positive electrode and the negative electrode are deposited at the negative electrode. The deposition potential is variable in accordance with a state of charge of the energy storage device, and/or charge time of the energy storage device, and/or current inputted to the energy storage device, and/or temperature of the energy storage device.

Abstract: Provided is an energy storage device state estimation device (100) for estimating a state of an energy storage device (200), the energy storage device state estimation device (100) including: a temperature estimation part (110) configured to estimate a temperature of the energy storage device (200); and a state estimation part (120) configured to estimate a state of the energy storage device (200) using the temperature of the energy storage device (200), wherein the temperature estimation part (110) is configured such that the energy storage device (200) is divided into a plurality of regions, the respective regions are set as internal regions, a region outside the energy storage device (200) adjacently disposed to the internal region is set as an external region, and a temperature of the energy storage device (200) is estimated using an internal heat transfer amount which is a transfer amount of heat between the two internal regions disposed adjacently to each other and an external heat transfer amount which

Abstract: A measurement device 50 of an electrochemical element 30 that is connected, via a first switch 40, to a terminal part 22P having a load connected thereto, wherein: the measurement device 50 is provided with a current limitation unit 75 provided to a bypass path BP of the first switch 40, a current sensor 60 for measuring the current of the electrochemical element 30, and a processing unit 100; when a voltage difference ?V between the voltage of the electrochemical element 30 and the voltage of the terminal part 22P is equal to or greater than a prescribed value, the current limitation unit 75 permits the supply of power to the load through the bypass path BP, and when the voltage difference ?V is less than the prescribed value, the current limitation unit 75 cuts off the current to the bypass path BP; and in a period of time after the first switch 40 has been turned off and until the voltage difference ?V reaches the prescribed value due to a change in voltage of the terminal part 22P because of discharging o

Abstract: The invention relates to a battery cell (2), comprising a negative terminal (15), a positive terminal (16) and a fast discharging device (70), whereat the fast discharging device (70) comprises a first busbar (71) that is electrically connected to the negative terminal (15), a second busbar (72) that is electrically connected to the positive terminal (16) and an activation unit (75) that is connected to the first busbar (71) and to the second busbar (72). At least one connection element (91, 92) is arranged between at least one busbar (71, 72) and at least one terminal (15, 16), whereat the connection element (91, 92) is electrically conductive and a melting temperature of the connection element (91, 92) is lower than a melting temperature of the busbar (71, 72) and lower than a melting temperature of the terminal (15, 16). The invention also relates to a method for producing a corresponding battery cell (2).

Abstract: A diagnosis device diagnoses current cutoff devices connected in parallel and disposed on an energization path to an energy storage device mounted on a vehicle. The diagnosis device performs switch processing of switching one of the current cutoff devices to be diagnosed from an opened state to a closed state or from the closed state to the opened state and closing the other current cutoff device while an engine of the vehicle is stopped. The diagnosis device detects end-to-end voltage of the current cutoff device when current larger than a threshold flows through the current cutoff device after the switch processing, and diagnoses the current cutoff device based on the detected end-to-end voltage.

Abstract: An energy storage apparatus includes: energy storage devices each including an external terminal, the energy storage devices being arranged in a first direction; a bus bar including a plate-like conductive portion; and a neighboring member disposed between the energy storage devices. The conductive portion includes: a fusible portion where a width size, which is a size in a second direction orthogonal to the first direction, is defined by a pair of edges, the width size being smaller than a width size of other portions of the conductive portion; and a pair of enlarged width portions contiguously formed with both sides of the fusible portion in the first direction, a width size of the pair of enlarged width portions increasing in a direction away from the fusible portion.

Abstract: An open circuit voltage estimation device for estimating an open circuit voltage of an electric storage device includes a voltage measurement portion and a controller. The voltage measurement portion measures terminal voltages of the electric storage device. The controller is configured to: control the voltage measurement portion to measure the terminal voltages; store the terminal voltages in association with elapsed time since charge or discharge completion time; calculate a variation in terminal voltage per unit time at predetermined elapsed time since the charge or the discharge of the electric storage device is complete based on the terminal voltages measured by the voltage measurement portion; and estimate the open circuit voltage based on the predetermined elapsed time, the voltage at the predetermined elapsed time, and the variation.

Abstract: One aspect of the present invention provides a nonaqueous electrolyte secondary battery including a sulfur-containing positive electrode, a negative electrode, a cation exchange resin layer interposed between the positive electrode and the negative electrode, a positive electrode electrolyte, and a negative electrode electrolyte. The positive electrode electrolyte contains lithium polysulfide, and a sulfur equivalent concentration of the positive electrode electrolyte is higher than the sulfur equivalent concentration of the negative electrode electrolyte. Another aspect of the present invention provides a nonaqueous electrolyte secondary battery including a sulfur-containing positive electrode, a negative electrode, a cation exchange resin layer interposed between the positive electrode and the negative electrode, and a nonaqueous electrolyte.

Abstract: An energy storage device includes: a positive electrode terminal, a negative electrode terminal, an electrode assembly, a positive current collector and a negative current collector which respectively connect the positive electrode terminal and the negative electrode terminal to the electrode assembly. The positive current collector includes: a first connecting portion which is connected with the positive electrode terminal, and a second connecting portion which is connected with the electrode assembly and the first connecting portion. The first connecting portion includes: a base portion which is connected to the second connecting portion, and an attachment portion which is provided to protrude from the base portion in a direction which is opposite to a direction toward the positive electrode terminal. In the attachment portion, a through hole through which a shaft portion of the positive electrode terminal is inserted is formed.

Abstract: A vehicle-mounted power supply system according to the present invention is provided with: a main battery; a sub-battery; a voltage regulating unit which regulates the voltage of power supplied from the main battery and the sub-battery; and a state detecting unit which detects the state of the sub-battery.

Abstract: An energy storage apparatus includes: one or more energy storage devices; and a first outer covering and a second outer covering arranged outside said one or more energy storage devices. The energy storage apparatus further includes: a weld portion which is a joint portion between the first outer covering and the second outer covering formed by joining the first outer covering and the second outer covering to each other by welding; a heat-susceptible object; and a heat shielding portion arranged between the weld portion and the heat-susceptible object.

Abstract: An energy storage device is provided with a case including a lid body in which a gas release valve is formed. The gas release valve includes a thin wall with a thickness smaller than a thickness of a portion adjacent to the gas release valve. The thin wall includes an intermediate portion and two lateral portions that are arranged at positions sandwiching the intermediate portion in a first direction. As viewed from a normal direction to the lid body, the intermediate portion is disposed at the middle position in the first direction of the lid body and is formed with a width, in a second direction orthogonal to the first direction, smaller than those of the two lateral portions.