Charge/discharge control method for alkaline storage battery, and power supply system
View Patent ↗A charge/discharge control method for an alkaline storage battery ( 11 ) includes: obtaining in advance a coefficient (K) representing characteristics of a memory effect of the alkaline storage battery; causing the alkaline storage battery to perform a charge/discharge between a lower-limit depth-of-charge (SOCb), of which a depth-of-charge is set within a range of 10% to 30%, and an upper-limit depth-of-charge (S), of which a depth-of-charge is set within a range of 70% to 90%; calculating an additional charge electricity quantity (C) based on the coefficient (K), the upper-limit depth-of-charge (S), and a predetermined reference time (T); measuring a charging/discharging time during which the alkaline storage battery performs the charge/discharge; and performing a charge of the alkaline storage battery with the calculated additional charge electricity quantity added to the upper-limit depth-of-charge, each time when the measured charging/discharging time reaches the reference time.
1. A charge/discharge control method for an alkaline storage battery, the method comprising:
obtaining in advance a coefficient representing characteristics of a memory effect of the alkaline storage battery;
causing the alkaline storage battery to perform a charge/discharge between a lower-limit depth-of-charge, of which a depth-of-charge is set within a range of 10% to 30%, and an upper-limit depth-of-charge, of which a depth-of-charge is set within a range of 70% to 90%;
calculating an additional charge electricity quantity based on the coefficient, the upper-limit depth-of-charge, and a predetermined reference time;
measuring a charging/discharging time during which the alkaline storage battery performs the charge/discharge; and
performing a charge of the alkaline storage battery with the calculated additional charge electricity quantity added to the upper-limit depth-of-charge, each time when the measured charging/discharging time reaches the reference time.
2. The charge/discharge control method for an alkaline storage battery according to claim 1 , wherein the additional charge electricity quantity is calculated by using an equation, C=100−(S−KT), where K represents the coefficient, S represents the upper-limit depth-of-charge, T represents the reference time, and C represents the additional charge electricity quantity.
3. The charge/discharge control method for an alkaline storage battery according to claim 2 , wherein the upper-limit depth-of-charge S and the reference time T are determined so as to satisfy an inequation, 60<(S−KT)<90.
4. The charge/discharge control method for an alkaline storage battery according to claim 2 , wherein an upper limit of the additional charge electricity quantity is set at 20% of a battery capacity of the alkaline storage battery.
5. The charge/discharge control method for an alkaline storage battery according to claim 1 , wherein the reference time is set within a range of 70 to 200 hours and is set at a time in accordance with the characteristics of the memory effect of the alkaline storage battery.
6. The charge/discharge control method for an alkaline storage battery according to claim 1 , wherein the charge with the calculated additional charge electricity quantity added to the upper-limit depth-of-charge is performed at a current value set within a range of 3 to 15 It.
7. A power supply system, comprising:
a power source unit that includes an alkaline storage battery;
a first calculator that calculates a depth-of-charge of the power source unit;
a charge/discharge controller that causes the power source unit to perform a charge/discharge between a lower-limit depth-of-charge, of which a depth-of-charge is predetermined within a range of 10% to 30%, and an upper-limit depth-of-charge, of which a depth-of-charge is predetermined within a range of 70% to 90%, based on the depth-of-charge of the power source unit calculated by the first calculator;
a storage unit in which a coefficient representing characteristics of a memory effect of the alkaline storage battery included in the power source unit and a predetermined reference time are stored in advance;
a timer unit that measures a charging/discharging time during which the alkaline storage battery performs the charge/discharge; and
a second calculator that calculates an additional charge electricity quantity based on the coefficient stored in the storage unit, the predetermined upper-limit depth-of-charge, and the reference time stored in the storage unit, wherein
the charge/discharge controller performs a charge of the power source unit with the additional charge electricity quantity, which is calculated by the second calculator, added to the upper-limit depth-of-charge, each time when the charging/discharging time measured by the timer unit reaches the reference time.
8. The power supply system according to claim 7 , wherein the second calculator calculates the additional charge electricity quantity by using an equation, C=100−(S−KT), where K represents the coefficient, S represents the upper-limit depth-of-charge, T represents the reference time, and C represents the additional charge electricity quantity.
9. The power supply system according to claim 8 , wherein the upper-limit depth-of-charge S and the reference time T are determined so as to satisfy an inequation, 60<(S−KT)<90.
10. The power supply system according to claim 8 , wherein the second calculator sets an upper limit of the additional charge electricity quantity at 20% of a battery capacity of the alkaline storage battery.
11. The power supply system according to claim 7 , wherein the storage unit stores the reference time that is set within a range of 70 to 200 hours and is set at a time in accordance with the characteristics of the memory effect of the alkaline storage battery.
12. The power supply system according to claim 7 , wherein the charge/discharge controller performs the charge with the calculated additional charge electricity quantity added to the upper-limit depth-of-charge at a current value set within a range of 3 to 15 It.