Abstract: A control device 120 of an energy storage cell 62 calculates an SOC or a remaining charge of the energy storage cell 62 by a current integration method, and determines a command value of a charge voltage for the energy storage cell based on the SOC or the remaining charge obtained by the current integration method.

Abstract: The energy storage apparatus includes an energy storage device, a circuit breaker connected in series with the energy storage device, a reception unit that receives a discharge instruction to discharge remaining electric power of the energy storage device, and a management unit. The management unit executes protection processing of opening, when a state of charge of the energy storage device drops below a predetermined threshold value, the circuit breaker to protect the energy storage device from overdischarging, and protection release processing of releasing protection of the energy storage device when the discharge instruction is received by the reception unit.

Abstract: A diagnostic device and method diagnoses damage to a breaker that interrupts a current of an energy storage device. The damage to the breaker is diagnosed on the basis of a short-circuit current at a time of an external short circuit. The damage to the breaker can also be diagnosed on a basis of a short-circuit current during a first time from detection to interruption of a short circuit, and a short-circuit current during a second time from the interruption to convergence of the short-circuit current. An energy storage apparatus can include the diagnostic device.

Abstract: This charging control device 50 controls charging of electricity storage elements B1-B4 and is provided with: a plurality of charging paths 61A, 61B leading to the electricity storage elements and connected in parallel with each other; voltage drop elements 64A, 64B and switches 65A, 65B which are connected in series on the charging paths; and a control unit 100. The control unit 100 controls the switches 65A, 65B and thereby switches a charging path not to be energized among the plurality of charging paths 61A, 61B during charging.

Abstract: A method for diagnosing failure of a current breaking device 21A included in a power supply system 12 of a vehicle 1 includes: a supply step of supplying power to a first electric load 11 and a first energy storage apparatus 13 by a power supply apparatus 14; a command step of commanding the current breaking device 21A to perform cutoff while power is supplied from the power supply apparatus 14 to the first electric load 11 and the first energy storage apparatus 13; and a determination step of measuring a charge current of a secondary battery 20A by a current sensor 21B while the cutoff is commanded to the current breaking device 21A, and determining presence or absence of failure of the current breaking device 21A based on a measured current value.

Abstract: A current measurement device 50 for measuring the current of a power storage element comprises a measurement resistor unit 80 that is positioned on a current path and comprises a resistor 81, a pair of detection points Pa, Pb that are positioned on the current path on both sides of the resistor 81, a current detection unit 160 that comprises a pair of voltage input units 161A, 161B that are connected to the pair of detection points Pa, Pb and detects the current of the power storage element from the voltage difference between the pair of detection points, and a ground connection point Pg that is connected to a common ground GND with the current detection unit 160.

Abstract: An energy storage apparatus includes external terminals, an energy storage device, a switch located in a current path from the energy storage device to the external terminal, a measurement unit that measures a current and a voltage of the energy storage device, and a management unit. The management unit cuts off discharge to an outside through the external terminal by controlling the switch when the voltage of the energy storage device falls below a threshold voltage equal to or higher than a minimum operating voltage of the measurement unit, and the management unit estimates a capacity of the energy storage device after an arbitrary time point t1 in a first period in which the voltage of the energy storage device decreases from the threshold voltage to the minimum operating voltage of the measurement unit based on an elapsed time from the arbitrary time point.

Abstract: A management device for an energy storage device, includes a processing unit that manages the energy storage device. When the management device for the energy storage device has lost power due to a voltage drop of the energy storage device, the processing unit determines whether cause of the power loss is an external short circuit between external terminals of the energy storage device or an engine start, and the processing unit executes a response operation according to the occurrence of the external short circuit in the case of the external short circuit, and does not execute the response operation in the case of the engine start.

Abstract: A management apparatus for an energy storage device, which performs current measurement processing for measuring a current of the energy storage device by using a measuring resistor having one side connected to the energy storage device and the other side connected to an external terminal, temperature measurement processing for measuring at least one of a temperature of the energy storage device and a temperature of the external terminal, and correction processing for correcting, when there is a temperature difference between the temperature of the energy storage device and the temperature of the external terminal, a measurement error caused by the temperature difference for a measured current value measured by the current measurement processing, or guarantee processing for guaranteeing a function to be performed in accordance with a measured current value measured by the current measurement processing.

Abstract: The present invention addresses the problem of diagnosing a failure of a discharge resistor, while suppressing deterioration of discharge capacity. Disclosed is a failure diagnostic device for a discharge circuit 60 for discharging electricity from an electricity storage element 31. The discharge circuit 60 includes a resistance circuit 61 comprising a plurality of resistor blocks B connected in parallel, and each of the resistor blocks B comprises a plurality of discharge resistors Ra, Rb connected in series. During the time when electricity is being discharged from the electricity storage element 31, the failure diagnostic device diagnosis a failure of the resistance circuit 61 on the basis of a voltage or a current at a connection point P between the discharge resistors Ra, Rb.

Abstract: An energy storage apparatus includes: an external terminal connected to an energy storage device; a current cut-off device disposed on a current path connecting the energy storage device and the external terminal to each other; a voltage applying circuit that applies a voltage to the external terminal using the energy storage device or another circuit as a power source; and a control device. The control device is configured to perform: current cut-off processing for cutting off flowing of a current into the energy storage device by bringing the current cut-off device into an OPEN state; detecting processing for detecting a voltage of the external terminal to which a voltage is applied by the voltage applying circuit during a period in which the flowing of the current is cut off by the current cut-off processing; and determining processing for determining a presence or a non-presence of a short-circuiting object.

Abstract: A battery management system (BMS) is provided, which includes: an on-off switch provided in a current path connecting an assembled battery and electrical equipment; a controller that switches the on-off switch to an off-state when an abnormality in the assembled battery is expected; and a bypass route connected in parallel with the on-off switch and having at least one of a parasitic diode that allows current to flow only in a direction of charging the assembled battery and a parasitic diode that allows current to flow only in a direction of discharging the assembled battery. A second excitation coil is connected in series with the parasitic diode and the parasitic diode 50B in the bypass route, the second excitation coil switching the on-off switch to an on-state with magnetic flux by flow of current with a predetermined current value.

Abstract: A diagnostic device diagnoses damage to a breaker that interrupts a current of an energy storage device. The damage to the breaker is diagnosed on the basis of a short-circuit current at a time of an external short circuit.

Abstract: The energy storage apparatus includes an energy storage device, a circuit breaker connected in series with the energy storage device, a reception unit that receives a discharge instruction to discharge remaining electric power of the energy storage device, and a management unit. The management unit executes protection processing of opening, when a state of charge of the energy storage device drops below a predetermined threshold value, the circuit breaker to protect the energy storage device from overdischarging, and protection release processing of releasing protection of the energy storage device when the discharge instruction is received by the reception unit.

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: An energy storage apparatus for supplying electric power to auxiliaries and a starter that starts an engine of an idling-stop vehicle, the energy storage apparatus including: an energy storage device; a measurement part (current sensor) that measures a physical quantity relating to a voltage drop of the energy storage device; and a management part that manages the energy storage device. The management part executes an estimation process of estimating, based on the physical quantity, a minimum voltage of the energy storage device during restart of the engine at a predetermined time point during idling-stop of the idling-stop vehicle, and a notification process of notifying a restart request for the engine to the idling-stop vehicle when the minimum voltage is less than a predetermined threshold.

Abstract: A management device for an energy storage device, includes a processing unit that manages the energy storage device. When the management device for the energy storage device has lost power due to a voltage drop of the energy storage device, the processing unit determines whether cause of the power loss is an external short circuit between external terminals of the energy storage device or an engine start, and the processing unit executes a response operation according to the occurrence of the external short circuit in the case of the external short circuit, and does not execute the response operation in the case of the engine start.

Abstract: A current measuring device of an energy storage device includes: a current breaker that is provided on a current path of the energy storage device; a first current sensor that is on the current path and measures a current of the energy storage device; a second current sensor that is connected in parallel with the current breaker; and a processing unit, in which the second current sensor includes a sensor having a smaller resolution than the first current sensor, and the processing unit performs measurement processing of measuring the current of the energy storage device by selectively using the first current sensor and the second current sensor according to a predetermined selection condition, and failure detection processing of detecting a failure in the current breaker on the basis of a measured value of the second current sensor when the current breaker is switched to open or close.

Abstract: This charging control device 50 controls charging of electricity storage elements B1-B4 and is provided with: a plurality of charging paths 61A, 61B leading to the electricity storage elements and connected in parallel with each other; voltage drop elements 64A, 64B and switches 65A, 65B which are connected in series on the charging paths; and a control unit 100. The control unit 100 controls the switches 65A, 65B and thereby switches a charging path not to be energized among the plurality of charging paths 61A, 61B during charging.

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