Battery charge/discharge control device and hybrid vehicle using the same

摘要

A battery charge/discharge control device (20) includes an input-enabled power adjustment unit (40) having an input-enabled current value calculation unit (42) and an input power limit value calculation unit (44). The input-enabled current value calculation unit (42) uses a battery current value, a battery temperature value, and an estimated charge capacity value at the time “t” upon execution of detection, so as to obtain an input-enabled current value reduction amount per unit time during charge and an enabled current amount recovery amount per unit time when being left uncontrolled. Moreover, the input-enabled current value calculation unit (42) calculates an input-enabled current value Ilim(t) to a battery (10) according to the previously calculated input-enabled current value Ilim(t−1) which has been calculated previously or the only initially set input-enabled current value The input power limit value calculation unit (44) calculates the battery input power limit value so that the input current limit target value obtained in accordance with the input-enabled current value Ilim(t) is greater than an actual battery current value. Thus, the input-enabled power to the battery (10) is adjusted in accordance with the battery input power limit value.

主权项

1. A battery charge/discharge control device comprising:
a control unit programmed to:
determine whether or not a charge history exists for a battery formed of a lithium ion secondary battery;based on a determination that no charge history exists, calculate the input-enabled power according to a first calculation, based on an enabled charge current which is set as a maximum current with which metal lithium does not precipitate on the negative electrode, and based on a charge continuation time and a discharge continuation time;based on a determination that the charge history exists, calculate the input-enabled power according to a second calculation, based on the enabled charge current which is set as the maximum current with which metal lithium does not precipitate on the negative electrode, and based on the charge continuation time and the discharge continuation time, wherein the second calculation is different from the first calculation;change the enabled charge current such that the enabled charge current decreases in accordance with the charge continuation time and increases in accordance with the discharge continuation time,adjust, during charge and discharge, the input-enabled power to the battery, such that a negative electrode potential of the battery is not lowered to a lithium reference potential, andcontrol a charge current to not exceed the enabled charge current, wherein the battery charge/discharge control device is mounted on a motor-driven vehicle, and the battery is configured to supply power to a motor of the motor-driven vehicle and store electric power resulting from regenerative energy.