Abstract: An energy storage system includes an energy storage device; a current cutoff unit configured to cut off current of the energy storage device; a communication connector to be connected with an external communication connector; a detection terminal provided to the communication connector; and a control unit configured to control the current cutoff unit based on a connection state of the detection terminal of the communication connector when the communication connector is connected with the external communication connector. In a method of monitoring an energy storage device mounted on a vehicle, when a communication connector including a detecting terminal is connected with an external communication connector of the vehicle, current between the energy storage device and the vehicle is cut off based on a connection state of the detection terminal.

Abstract: A sealing member (positive electrode first sealing member) disposed between a terminal (positive electrode terminal), which is provided on a case of an energy storage device, and the case or between a current collector (positive electrode current collector), which is electrically connected with the terminal, and the case. The sealing member includes a first surface (bottom surface) which faces the case and a second surface (bottom surface) which is opposite to the first surface and faces the terminal or the current collector. A first protrusion is formed on the first surface, the first protrusion surrounding a shaft portion of the terminal. A second protrusion is formed on the second surface, the second protrusion surrounding the shaft portion of the terminal. A protrusion amount of the first protrusion is different from a protrusion amount of the second protrusion.

Abstract: An energy storage device includes: an electrode assembly which includes: an approximately rectangular positive electrode; an approximately rectangular negative electrode which is stacked alternately with the positive electrode; and a strip-like elongated separator having a base material layer and an inorganic layer which is made to overlap with the first base material layer, wherein the elongated separator is arranged between the positive electrode and the negative electrode, and the base material layer of the elongated separator faces the negative electrode in an opposed manner between the positive electrode and the negative electrode.

Abstract: Provided is an estimation device for estimating an actual capacity of an energy storage device or a total reduction amount of the actual capacity. The estimation device includes a processor which is configured to calculate the actual capacity of the energy storage device or the total reduction amount of the actual capacity based on approximation data where a capacity change curve indicative of a transition of the actual capacity or a transition of the total reduction amount of the actual capacity with respect to an elapsed time is approximated by a plurality of straight lines.

Abstract: An energy storage device includes an electrode body in which an electrode is wound, a case that stores the electrode body, and spacers (side spacers) interposed between the case and the electrode body. The spacers each have an opening that exposes a portion of faces of curved portions of the electrode body from one end to the other end of the electrode body in a winding axis direction of the electrode body.

Abstract: An energy storage device includes: an electrode assembly; a case accommodating the electrode assembly; a lid plate structure including a lid plate of the case, a current collector electrically connected to a tab provided at the electrode assembly, and an insulating member disposed between the lid plate and the current collector; and a first spacer disposed between an end provided with the tab of the electrode assembly and the lid plate and having a locked portion locked to part of the lid structure.

Abstract: A state estimation apparatus configured to estimate a state of an assembled battery including a plurality of energy storage devices. The energy storage devices each have a small-variation region where an open circuit voltage (OCV) variation amount relative to a residual capacity is smaller, and a variation region where the OCV variation amount relative to the residual capacity is greater than the OCV variation amount relative to the residual capacity in the small-variation region. The state of the assembled battery is estimated based on a varying position of the variation region relative to an actual capacity of the plurality of energy storage devices.

Abstract: An energy storage device includes: a conductive member (shaft portion) which penetrates a case and is connected to a terminal main body (bus bar connecting portion. The case includes: a through hole through which the conductive member penetrates; a concave portion which is at least a portion of a periphery of the through hole and is formed on one of an inner surface and an outer surface of the case, and a convex portion which is formed at a position opposite to the concave portion on an other of the inner surface and the outer surface of the case. In a plan view of the outer surface of the case, the terminal main body has a shape such that at least a portion of the terminal main body is larger than the concave portion.

Abstract: An energy storage device includes: an electrode assembly formed by stacking plates; and a first conductive member welded to one of both surfaces of a converged portion on an end portion of the electrode assembly without covering the converged portion from an end portion side, wherein a welding surface of a welded portion where the electrode assembly and the first conductive member are welded to each other is disposed at a position recessed from an outer surface of the first conductive member.

Abstract: A negative electrode material contains an organic anti-shrink agent which is soluble in water, and the organic anti-shrink agent, when extracted from the negative electrode material with an alkali aqueous solution, has an average particle size of not less than 0.1 ?m and not more than 9 ?m in sulfuric acid having a specific gravity of 1.25. A lead-acid battery includes a negative electrode plate containing an organic anti-shrink agent having a S element content of 4000 ?mol/g or more. The negative electrode contains 0.3 mg/cm3 or more of the S element in the organic anti-shrink agent.

Abstract: In an energy storage device (10) including: a container (100) including a plate-like portion; a positive electrode terminal (200) including a terminal body portion (201); a positive electrode current collector (120); a first gasket (220) including at least a portion that is disposed between the terminal body portion (201) and an outer surface of the plate-like portion, the first gasket (220) including a cylindrical portion (223) that is inserted into the hole portion formed in the plate-like portion; a second gasket (230) including at least a portion that is disposed between an inner surface of the plate-like portion and the positive electrode current collector (120); and a fixing portion (210) including a columnar portion (212) and a swaged portion (214) brought into contact with the positive electrode current collector (120), wherein the cylindrical portion (223) includes an extension portion extending toward the swaged portion (214) from a contact surface at which the inner surface of the plate-like portio

Abstract: A battery includes an outer package including a laminated film including one or more resin layers, a terminal, and a melt-bonding assisting member including a thermoplastic resin and extending along the terminal. The outer package includes a melt-bonded region at which the terminal is sandwiched between the one or more resin layers via the melt-bonding assisting member. The terminal includes an inner part, a sandwiched part, and an outer part arranged in a first direction. The battery has a discharge capacity of 10 Ah or more.

Abstract: A storage amount estimation device is provided that can estimate a storage amount of an energy storage device containing an active material in which a storage amount-voltage characteristic exhibits a hysteresis, an energy storage module including the storage amount estimation device, a storage amount estimation method, and a computer program. An energy storage device contains an active material exhibiting hysteresis between a storage amount-voltage charge characteristic and a storage amount-voltage discharge characteristic in a positive electrode and/or a negative electrode, the active material generating a plurality of electrochemical reactions according to transition of charge-discharge.

Abstract: An energy storage apparatus includes: one or more energy storage devices; an outer case; and a plate-like spacer disposed between the energy storage device at an end among the above-mentioned one or more energy storage devices and the outer case.

Abstract: An energy storage device is provided in which a decrease in power caused by repetitive charge-discharge in a high-temperature environment is suppressed. In the present embodiment, an energy storage device and a method for manufacturing the energy storage device are provided, the energy storage device including an electrode which includes: an active material layer including a particulate active material; and a conductive layer layered on the active material layer and including a conduction aid. An average secondary particle diameter of the active material is 2.5 ?m or more and 6.0 ?m or less. A surface roughness Ra of the conductive layer on a side on the active material layer is 0.17 ?m or more and 0.50 ?m or less.

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, and a nonaqueous electrolyte. A positive electrode charge potential is 3.7 V or less with respect to a lithium metal potential. The nonaqueous electrolyte includes a cyclic disulfone compound having a specific structure in an amount of 0.1 to 4.0% by mass based on a total mass of the nonaqueous electrolyte.

Abstract: An energy storage device in which a micro-short circuit at the time of heat generation is suppressed is provided. The energy storage device includes: a positive electrode; a negative electrode containing a negative composite layer; and a separator disposed between the positive electrode and the negative electrode. The separator contains a base material layer containing a thermoplastic resin and an inorganic layer formed on the base material layer, the inorganic layer opposes to the positive electrode, the base material layer opposes to the negative electrode, and a ratio of a mass of the base material layer per unit area to a spatial volume of the negative composite layer is 0.26 or more.

Abstract: A managing apparatus for an electrochemical element mounted on a vehicle, including: a control unit activating at an interval of a predetermined time in a parked mode of the vehicle; and a current measuring unit measuring a current value. The control unit executes: a determination process of determining a reference value based on measured current values measured for a plurality of times upon the activation of the control unit; a check process of checking, at the interval of the predetermined time, whether or not a measured current value measured after the determination process deviates from a reference range that is based on the reference value; and an estimation process of estimating current, which has flowed in the parked mode by integrating, while the measured current value measured in the check process does not deviate from the reference range, current based on the reference value.

Abstract: An electric storage device includes an electric storage element including an external terminal, and a bus bar connected to the external terminal. The bus bar includes a thin-walled portion and a thick-walled portion, the thin-walled portion being located around outer edges of the bus bar. The thin-walled portion and the external terminal are directly welded together. A thickness of the thin-walled portion is less than a thickness of a remaining portion of the bus bar including the thick-walled portion.

Abstract: An electric storage device according to the present invention includes: an electrode assembly including positive and negative electrode plates that are insulated from each other, at least one of the electrode plates having an active material layer formed part and an active material layer non-formed part; positive and negative current collectors; and a metal material abutted against the active material layer non-formed part, wherein the metal material includes a curled part in which an edge of the metal material is curved in a direction away from the active material layer non-formed part, and the active material layer non-formed part, each of the current collectors, and the metal material are integrally coupled.