Nissan Motor Company Limited

Tsutomu Soga

Atsushi Takano

Takashi Iimori

Naoki Yamamoto

Kazuhiko Okino

Shinsuke Higuchi

Kouichi Akabori

Hayato Nagakura

Hisashi Niioka

Kazuma Tamai

Yoshimasa Toki

Takashi Limori

A charge state calculation device includes a detection means for detecting the voltage and/or the current of a battery, a charge state calculation means for calculating the charge state of the battery, a full charge detection means for detecting the full charge of the battery, a correction value calculation means for calculating, when the full charge of the battery is detected, a correction value for correcting the charge state to the charge state of 100%, a correction means for correcting a charge state by the correction value, and a display means for displaying the charge state thus corrected by the correction means. The correction value calculation means updates the correction value only when the full charge of the battery is detected, and maintains the updated correction value until next time the full charge of the battery will be detected.

Charge state calculation device and charge state calculation method

A residual capacity calculation apparatus for a battery includes a current detection device to detect a charge/discharge current of the battery and a voltage detection device to detect an open circuit voltage of the battery, and a controller. The controller is configured to calculate a first residual capacity based on an integrated value of the charge/discharge current of the battery, calculate a second residual capacity based on the open circuit voltage of the battery, determine a blend rate of the second residual capacity based on a deviation between the first residual capacity and the second residual capacity, calculate a post-combination residual capacity by subjecting the first residual capacity and the second residual capacity to weighted combination with use of the blend rate, and increase the blend rate as the deviation between the first residual capacity and the second residual capacity increases.

Control device and control method for electric vehicle

A battery temperature adjustment apparatus including a battery, a temperature adjustment section configured to operate by power supplied from an external power source or the battery and adjust a temperature of the battery by heating or cooling, a detection section configured to detect a temperature of the battery, and a control section configured to change an operating condition or an operating state of the temperature adjustment section according to whether or not the external power source to supply power to the battery is electrically connected, and in a case where the external power source is not electrically connected, restrict the operation of the temperature adjustment section so as to reduce power consumed in the battery as compared to a case where the external power source is electrically connected.

Battery-temperature adjustment apparatus

A charge control device that charges a battery using a power output from a charger has a charge state (SOC) calculation unit for calculating the SOC of the battery using the voltage and current of the battery, a charger control unit that controls a charger that charges the battery, and a charge time calculation unit for calculating, on the basis of the SOC calculated by the SOC calculation unit, the remaining charge time of the battery till the SOC of the battery reaches a prescribed SOC. When the charge current falls below a current threshold, the charger control unit sends intermittent power commands to the charger based on the prescribed SOC, and the charge time calculation unit subtracts, from the charge time calculated when the charge current has fallen below the current threshold, predetermined time values based on the power commands.

Charge control device and charge time calculation method

A charge control device includes a charge state (SOC) calculation unit that calculates the SOC of a battery using the voltage and current of the battery. A chargeable power calculation unit calculates the power with which to charge the battery and a charge power calculation unit calculates the charge power to be supplied from the charger. A charge time calculation unit uses a map that correlates in part combinations of charge state values and charge power values to output charge time values is used by the charge state calculation unit when the chargeable power is greater than the outputtable power. When the chargeable power for charging is less than the outputtable power, the charge time calculation unit calculates the remaining charge time by using the map to reduce the remaining charge time determined from the map.

A charging device includes charging power detection unit and full charge determination unit. The charging device further includes charging control unit adapted to repeatedly execute a additional charging control until the number of times of the full charge determination reaches a predetermined full charge determination count. The charging device further includes unit adapted to detect the temperature of the secondary battery, and full charge determination count setting unit adapted to set a larger full charge determination count as the temperature decreases at least based on the temperature of the secondary battery when the full charge determination is made.

Charging device for secondary battery and charging method for secondary battery

A capacity estimating apparatus for a secondary battery includes a current-detecting section configured to detect a value of current flowing in the secondary battery; a voltage-detecting section configured to detect a voltage value of the secondary battery; a first estimating section configured to calculate a first estimate value of a remaining capacity of the secondary battery on the basis of an accumulated value of the current values detected by the current-detecting section; and a second estimating section configured to calculate a second estimate value of the remaining capacity of the secondary battery on the basis of the voltage value detected by the voltage-detecting section. The first estimating section is configured to calculate a difference between the first estimate value and the second estimate value, and to correct the first estimate value by correcting the accumulated value so as to gradually reduce the difference.

Capacity estimating apparatus for secondary battery

A charging device for a storage battery includes: a charging power source for supplying electric power to a storage battery; a charging electric power detecting device adapted to detect electric power charged to the storage battery; a full charge determining device adapted to make a full charge determination based on a detected value of the charging electric power detecting device; and a charging controlling device adapted to conduct charging control by charging the storage battery until the full charge determination is made, stopping charging when the full charge determination is made, restarting charging after a prescribed time period elapses from the stop of charging, and continuing charging until the full charge determination is made again. The charging device further includes a temperature detecting device adapted to detect a temperature of the storage battery; and a stop time setting device adapted to set a stop time based on at least the temperature of the storage battery at the full charge determination. The stop time setting device sets the stop time to be longer as the detected temperature of the temperature detecting device becomes lower.

Charging device for storage battery, and charging method for storage battery

At a timing of time tbattery temperature Tbat lowers to Tbat_start and a warm-up request occurs, SOC at this time is a level, like time t, which allows a vehicle to travel by itself up to a battery charging facility and allows a battery charger to be connected to the battery charging facility. Since a warm-up permission judging value is set to SOCs_low that is substantially 0 at time t, in response to judgment of 'SOC&#x2267;SOCs_low (&#x2248;0)', warm-up of the battery is carried out from time tas shown by a solid line, then Tbat can be increased from time t. A battery charge time can be thus shortened. With this, in order that the battery does not freeze while the battery is unused, a control that warms up the battery by a battery-driven heater is performed while shortening the battery charge time.

Battery temperature control device

When warming-up of a battery is in progress (S), a battery charge state at the warming-up start time of the battery is set to a battery hold capacity SOC(S, S), and a charge power for the battery is controlled so that a battery charge state SOC is kept at SOC. When a present time is in a timer charge reservation time (S), the charge power for the battery is controlled so that SOC becomes a full charge state SOC(S). Even if SOC has a tendency to temporarily decrease due to a rapid increase of heater consumption power just after start of warming-up of the battery, by keeping SOC at SOC(SOC=SOC), SOC can reach a full charge state as intended during the timer charge reservation time. A proportion of charge using low-priced midnight power is increased to a maximum then running cost can be suppressed.

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Machida, Japan

Tsutomu Soga