Vehicle Energy Japan Inc.

Yosuke Wada

Keiichiro Ohkawa

Ryohhei Nakao

Fanny Matthey

A battery management apparatusis an apparatus which manages a chargeable and dischargeable battery, and includes: a battery state calculation unitwhich 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 unitwhich 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 unitwhich 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 unitwhich calculates available energy of the battery, based on the mid voltage and the remaining capacity.

Battery management apparatus, battery management method, and battery energy storage system

An apparatus coupled to an assembled battery with a plurality of serially-connected cells and for setting any one of the plurality of cells as a target cell and estimating a state of charge of the target cell includes: a cell voltage acquisition unit that acquires a measurement result of a closed circuit voltage of the target cell; a reference cell information acquisition unit that sets a reference cell with respect to the plurality of cells and acquires a closed circuit voltage and an open circuit voltage of the reference cell and a reference SOC value representing a state of charge of the reference cell; a temporary SOC operation unit that finds a temporary SOC value representing a temporary state of charge of the target cell on the basis of the closed circuit voltage of the target cell and the closed circuit voltage and the open circuit voltage of the reference cell; and an SOC operation unit that finds an SOC value representing the state of charge of the target cell by using a result of smoothing processing executed on a difference between the temporary SOC value and the reference SOC value.

Growing community of inventors

Hitachinaka, Japan

Yosuke Wada