Abstract: A battery management apparatus 102 calculates a state of charge SOC representing the state of charge of a chargeable and dischargeable battery, a charge deterioration degree SOHQ and a resistance deterioration degree SOHR, corrects the calculated SOHR, corrects an mid resistance MidDCR corresponding to a mid voltage MidVoltage according to a correction coefficient in accordance with SOHR for MidDCR (corrected SOHR), calculates MidVoltage (a mid voltage present between a discharge voltage in the current state of charge of the battery, and a voltage value representing a discharge voltage in the minimum state of charge of the battery), calculates the remaining capacity of the battery based on SOC and SOHQ, and calculates the available energy of the battery based on the mid voltage and the remaining capacity.

Abstract: An appropriate upper limit current value is set in consideration of steep change in battery voltage in a high-current region caused by the ion concentration gradient in a diffusion layer formed around an interface between an electrode and an electrolyte. An upper limit current calculator 152 includes: a concentration gradient estimator 1523 that estimates a lithium ion concentration gradient in a diffusion layer formed around an interface between an electrode and an electrolyte of a battery, based on a current flowing in the battery, or on the current and a temperature; and an upper limit current determiner 1524 that determines an upper limit current value of the battery, based on the lithium ion concentration gradient. The upper limit current determiner 1524 determines the upper limit current value such that an overvoltage of the battery according to the lithium ion concentration gradient falls within a predetermined range.

Abstract: Provided is a battery system in which a battery cell does not exceed a use limit temperature, and a time taken for returning to the charging/discharging process is shortened even if a frequency for the battery system to stop a charging/discharging process is reduced and the charging/discharging process is stopped. The battery system disclosed in the invention includes a plurality of battery cells and a control circuit which controls a charging/discharging current of the battery cell. The control circuit performs a plurality of temperature rising estimations on the basis of a battery temperature, a charging/discharging current, and a time width of a time window. The control circuit selects the charging/discharging current corresponding to a temperature rising estimation in which the temperature of the battery cell does not exceed a use limit temperature among the temperature rising estimations.

Abstract: A battery management apparatus 102 is an apparatus which manages a chargeable and dischargeable battery, and includes: a battery state calculation unit 501 which calculates a state of charge SOC representing the state of charge of the battery, and a charge capacity fade SOHQ representing a deterioration degree; a mid voltage calculation unit 502 which calculates a mid voltage that is present between the discharge voltage in a current state of charge of the battery, and a voltage value representing the discharge voltage in a minimum state of charge of the battery; a remaining capacity calculation unit 503 which calculates a remaining capacity of the battery, based on the state of charge SOC and the charge capacity fade SOHQ; and an available energy calculation unit 504 which calculates available energy of the battery, based on the mid voltage and the remaining capacity.

Abstract: An appropriate upper limit current value is set in consideration of steep change in battery voltage in a high-current region caused by the ion concentration gradient in a diffusion layer formed around an interface between an electrode and an electrolyte. An upper limit current calculator 152 includes: a concentration gradient estimator 1523 that estimates a lithium ion concentration gradient in a diffusion layer formed around an interface between an electrode and an electrolyte of a battery, based on a current flowing in the battery, or on the current and a temperature; and an upper limit current determiner 1524 that determines an upper limit current value of the battery, based on the lithium ion concentration gradient. The upper limit current determiner 1524 determines the upper limit current value such that an overvoltage of the battery according to the lithium ion concentration gradient falls within a predetermined range.

Abstract: A battery management apparatus for managing a chargeable-dischargeable battery includes: a battery status calculation unit that calculates a degradation degree of the battery; a degradation speed calculation unit that calculates a degradation speed of the battery on the basis of the degradation degree; and an upper limit temperature setting unit that sets an upper limit temperature of the battery on the basis of the degradation speed, wherein the upper limit temperature setting unit raises the upper limit temperature in association with a decrease of the degradation speed.

Abstract: An evaluation device carries out evaluation for BESS that is a power storage system that includes a chargeable and dischargeable battery and provides a power stabilization service with respect to a power transmission network by using the battery. The evaluation device includes an information acquisition unit that acquires input information including at least specification information relating to specifications of the BESS, an estimation unit that estimates a life of the battery and a pecuniary profit in compensation for the service on the basis of the input information that is acquired by the information acquisition unit, and an optimization unit that determines a value of a control parameter, which is optimal for control of an operation of the BESS, on the basis of the life of the battery and the pecuniary profit which are estimated by the estimation unit.

Abstract: Provided is a battery system in which a battery cell does not exceed a use limit temperature, and a time taken for returning to the charging/discharging process is shortened even if a frequency for the battery system to stop a charging/discharging process is reduced and the charging/discharging process is stopped. The battery system disclosed in the invention includes a plurality of battery cells and a control circuit which controls a charging/discharging current of the battery cell. The control circuit performs a plurality of temperature rising estimations on the basis of a battery temperature, a charging/discharging current, and a time width of a time window. The control circuit selects the charging/discharging current corresponding to a temperature rising estimation in which the temperature of the battery cell does not exceed a use limit temperature among the temperature rising estimations.

Abstract: In a BESS management apparatus, a history database stores operation history data related to operation history of a BESS and price history data related to price history of a service. A state estimation unit estimates a state of charge and a state of health of a battery. A simulation unit calculates a performance score of the BESS with respect to providing of the service based on the operation history data stored in the history database and the state of charge and the state of health of the battery estimated by the state estimation unit. A price prediction unit calculates a predicted price of the service based on the price history data stored in the history database. A control parameter selection unit selects a control parameter for controlling an operation of the BESS based on the performance score and the predicted price.

Abstract: An evaluation device carries out evaluation for BESS that is a power storage system that includes a chargeable and dischargeable battery and provides a power stabilization service with respect to a power transmission network by using the battery. The evaluation device includes an information acquisition unit that acquires input information including at least specification information relating to specifications of the BESS, an estimation unit that estimates a life of the battery and a pecuniary profit in compensation for the service on the basis of the input information that is acquired by the information acquisition unit, and an optimization unit that determines a value of a control parameter, which is optimal for control of an operation of the BESS, on the basis of the life of the battery and the pecuniary profit which are estimated by the estimation unit.