BATTERY CHARGE/DISCHARGE CONTROL DEVICE AND HYBRID VEHICLE USING THE SAME
First Claim
1. A battery charge/discharge control device comprising an input-enabled power adjustment unit which adjusts, during charge and discharge, based on a charge history, input-enabled power to a battery formed of a lithium ion secondary battery, such that a negative electrode potential of the battery is not lowered to a lithium reference potentialwhereinthe input-enabled power adjustment unit determines the input-enabled power 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 changes the enabled charge current such that the enabled charge current decreases in accordance with a charge continuation time and increases in accordance with a discharge continuation time.
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Accused Products
Abstract
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.
59 Citations
15 Claims
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1. A battery charge/discharge control device comprising an input-enabled power adjustment unit which adjusts, during charge and discharge, based on a charge history, input-enabled power to a battery formed of a lithium ion secondary battery, such that a negative electrode potential of the battery is not lowered to a lithium reference potential
wherein the input-enabled power adjustment unit determines the input-enabled power 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 changes the enabled charge current such that the enabled charge current decreases in accordance with a charge continuation time and increases in accordance with a discharge continuation time.
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2. (canceled)
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4. A battery charge/discharge control device, comprising:
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an input-enabled power adjustment unit which adjusts, during charge and discharge, based on a charge history, an input-enabled power to a battery formed of a lithium ion secondary battery, such that a negative electrode potential of the battery is not lowered to a lithium reference potential; a battery current detection unit which detects a battery current; a battery temperature detection unit which detects a battery temperature; and a charge/discharge estimation unit which estimates a state of charge of the battery, wherein the input-enabled power adjustment unit includes; an input-enabled current value calculation unit which uses a battery current value, a battery temperature value, and an estimated charge capacity value at a time t upon execution of detection, so as to obtain an input-enabled current value reduction amount per unit time during charge or an input-enabled current value recovery amount per unit time during discharge and also an enabled current amount recovery amount per unit time when being left uncontrolled, and calculates an input-enabled current value Ilim(t) to the battery, based on a previously calculated input-enabled current value Ilim(t−
1) which has been calculated previously or an only initially set input-enabled current value Ilim(0); andan input power limit value calculation unit which calculates a battery input power limit value based on the input-enabled current value Ilim(t) which is obtained, and the input-enabled power adjustment unit adjusts the input-enabled power to the battery based on the battery input power limit value which is obtained. - View Dependent Claims (5, 6, 7, 8, 9, 12, 13, 15)
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Specification