초록 ▼

A maximum output power and a discharged electric power amount from the battery is calculated; a future variation in maximum output power relative to the discharged electric power amount is evaluated, thereby determining a remaining capacity of the battery on the basis of the electric power amount di

A maximum output power and a discharged electric power amount from the battery is calculated; a future variation in maximum output power relative to the discharged electric power amount is evaluated, thereby determining a remaining capacity of the battery on the basis of the electric power amount discharged until the maximum output power reaches a preset lowest maximum-output power. Thus, the remaining capacity of the battery can be correctly detected, irrespective of the charged state, the discharge rate, the degree of deterioration of the battery and the like.

대표청구항 ▼

A process for detecting a remaining capacity of a battery after a period of time of discharging use of the battery, comprising the steps of: measuring values of discharging current and voltage over the period of time; determining a discharging current-voltage relationship characteristic of the batte

A process for detecting a remaining capacity of a battery after a period of time of discharging use of the battery, comprising the steps of: measuring values of discharging current and voltage over the period of time; determining a discharging current-voltage relationship characteristic of the battery based on a relationship between said measured discharge current and voltage over a range of discharging currents and voltages; calculating maximum output power densities of the battery based on said determined relationship characteristic over the period of time; calculating discharged electric power amounts of the battery based on values of said measured discharge current and voltage over the period of time; determining a relationship between said maximum output power densities and said discharged electric power amounts over the period of time; determining a maximum discharged electric power amount at a preset lowest maximum output power density based on said determined relationship between maximum output power densities and discharged electric power amounts of the battery; determining the difference between said determined maximum discharged electric power amount and a present value of said calculated discharged electric power amount; detecting said determined difference as a present remaining capacity of the battery; and driving a battery system monitoring means in response to said detected remaining capacity of the battery.