Gs Yuasa International Ltd.

Yuki Imanaka

Atsushi Fukushima

Takeyuki Shiraishi

Masayuki Imura

Seiji Takai

Satoru Narimoto

A current measurement devicefor measuring the current of a power storage element comprises a measurement resistor unitthat is positioned on a current path and comprises a resistor, a pair of detection points Pa, Pb that are positioned on the current path on both sides of the resistor, a current detection unitthat comprises a pair of voltage input unitsA,B 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. The resistance Rga along the current path X to the ground connection point Pg from the detection point Pa from among the pair of detection points Pa, Pb that is closest to the ground connection point Pg is smaller than the value obtained by dividing the input voltage tolerance Vm of the current detection unitby a prescribed current of the power storage element.

Current measuring device and energy storage apparatus

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.

Management apparatus, management method, and vehicle

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 tin 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.

Energy storage apparatus, capacity estimation method for energy storage device, and capacity estimation program for energy storage device

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.

Energy storage apparatus, external discharge device, and discharge method of energy storage device

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.

Diagnostic device, energy storage apparatus, and diagnostic method

This charging control devicecontrols charging of electricity storage elements B-Band is provided with: a plurality of charging pathsA,B leading to the electricity storage elements and connected in parallel with each other; voltage drop elementsA,B and switchesA,B which are connected in series on the charging paths; and a control unit. The control unitcontrols the switchesA,B and thereby switches a charging path not to be energized among the plurality of charging pathsA,B during charging.

Charge control apparatus for controlling charging of an energy storage device via purality of charging paths connected in parallel anssociated energy storage appartus, and an associated charging method

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.

Management device, energy storage apparatus, and management method for energy storage device

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 circuitfor discharging electricity from an electricity storage element. The discharge circuitincludes a resistance circuitcomprising 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, the failure diagnostic device diagnosis a failure of the resistance circuiton the basis of a voltage or a current at a connection point P between the discharge resistors Ra, Rb.

Failure diagnostic device

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.

Energy storage apparatus, vehicle, and motorcycle

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 diodeB 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.

Protective apparatus for energy storage device

A measurement deviceof an electrochemical elementthat is connected, via a first switch, to a terminal partP having a load connected thereto, wherein: the measurement deviceis provided with a current limitation unitprovided to a bypass path BP of the first switch, a current sensorfor measuring the current of the electrochemical element, and a processing unit; when a voltage difference &#x394;V between the voltage of the electrochemical elementand the voltage of the terminal partP is equal to or greater than a prescribed value, the current limitation unitpermits the supply of power to the load through the bypass path BP, and when the voltage difference &#x394;V is less than the prescribed value, the current limitation unitcuts off the current to the bypass path BP; and in a period of time after the first switchhas been turned off and until the voltage difference &#x394;V reaches the prescribed value due to a change in voltage of the terminal partP because of discharging of a charge/discharge elementconnected in parallel to the load, the processing unitperforms a measurement process to measure the offset error &#x3b5; of the current sensor

Growing community of inventors

Kyoto, Japan

Yuki Imanaka