Apparatus and method for controlling charging and discharging of batteries

1. A method being executed by a microprocessor of an apparatus for controlling charging and discharging of batteries in a battery unit that supplies power to power-driven equipment, the apparatus electrically connected to the battery unit, the power-driven equipment, and an energy conversion system, the method comprising:

(a) setting number requirements of batteries to be connected to a discharge unit and a charge unit of the battery unit, and setting a cut-off discharge voltage and a nominal voltage of each battery, wherein each battery connects to a sensor;

(b) when the power-driven equipment is started, detecting an open-circuit voltage of each battery by the respective sensor connected to the battery;

(c) establishing connections of the batteries with the discharge unit and the charge unit according to the open-circuit voltages of the batteries and the number requirements;

(d) monitoring variations of the open-circuit voltages of the batteries during the discharge unit supplying power to the power-driven equipment and the energy conversion system charging the charge unit;

(e) switching connections of one or more first batteries from the discharge unit to the charge unit, wherein a current open-circuit voltage of each first battery is lower than the cut-off discharge voltage of the first battery; and

(f) switching connections of one or more second batteries from the charge unit to the discharge unit, wherein a current open-circuit voltage of each second battery equals the nominal voltage of the second battery.

2. The method of claim 1 , wherein the energy conversion system comprises solar power generation apparatuses, wind power generation apparatuses, and electronic chargers.

3. The method of claim 1 , wherein a cut-off discharge voltage of a battery is a voltage at which the battery is considered fully discharged, a nominal voltage of the battery is a typical voltage when the battery works with a usual temperature, and an open-circuit voltage of the battery is a difference of electrical potential between a positive terminal and negative terminal of the battery.

4. The method of claim 1 , wherein step (e) comprises:

(e1) selecting one first battery;

(e2) checking if the charge unit has been connected with a preset number of third batteries, wherein a current open-circuit voltage of each third battery in the preset number is equal to or more than a cut-off discharge voltage of the third battery;

(e3) sending a signal to alert users of the power-driven equipment that the battery unit has low battery charges if the charge unit has not been connected with the preset number of third batteries; and

(e4) switching the connection of the first battery from the discharge unit to the charge unit, and switching a connection of a battery, which is connected to the charge unit and has a highest current open-circuit voltage compared to other batteries connected to the charge unit, from the charge unit to the discharge unit.

5. The method of claim 4 , wherein step (e) further comprises:

(e5) determining if there is any battery in the battery unit that has a current open-circuit voltage higher than the cut-off discharge voltage of the battery;

(e6) continuously providing power to the power-driven equipment by the discharge unit, and returning to step (e1), when there is a battery in the battery unit that has a current open-circuit voltage higher than the cut-off discharge voltage of the battery; and

(e7) informing the discharge unit to stop supplying power to the power-driven equipment, when the current open-circuit voltage of each battery in the battery unit is equal to or less than the cut-off discharge voltage of the battery.

6. The method of claim 1 , wherein step (f) comprises:

(f1) selecting one second battery; and

(f2) switching the connection of the second battery from the charge unit to the discharge unit, and switching a connection of a battery, which is connected to the discharge unit and has a lowest current open-circuit voltage compared to other batteries connected to the discharge unit, from the discharge unit to the charge unit.

7. The method of claim 6 , wherein step (f) further comprises:

(f3) determining if there is any battery in the battery unit that has a current open-circuit voltage lower than the nominal voltage of the battery;

(f4) continuously charging the charge unit by the energy conversion system, and returning to step (f1), when there is a battery that has a current open-circuit voltage lower than the nominal voltage of the battery; and

(f5) sending a signal to alert the users that the charge unit has completed charging, when the current open-circuit voltage of each battery in the battery unit equals the nominal voltage of the battery.

8. An apparatus electrically connected to a battery unit that consists of multiple batteries and supplies power to power-driven equipment, the apparatus further connected to an energy conversion system and the power-driven equipment, the apparatus comprising:

a storage device;

at least one microprocessor; and

one or more programs executable by the at least one processor, the one or more programs comprising instructions to:

(a) set number requirements of batteries to be connected to a discharge unit and a charge unit of the battery unit, and set a cut-off discharge voltage and a nominal voltage of each battery, wherein each battery connects to a sensor;

(b) when the power-driven equipment is started, detect an open-circuit voltage of each battery by the respective sensor connected to the battery;

(c) establish connections of the batteries with the discharge unit and the charge unit according to the open-circuit voltages of the batteries and the number requirements;

(d) monitor variations of the open-circuit voltages of the batteries during the discharge unit supplying power to the power-driven equipment and the energy conversion system charging the charge unit;

(e) switch connections of one or more first batteries from the discharge unit to the charge unit, wherein a current open-circuit voltage of each first battery is lower than the cut-off discharge voltage of the first battery; and

(f) switch connections of one or more second batteries from the charge unit to the discharge unit, wherein a current open-circuit voltage of each second battery equals the nominal voltage of the second battery.

9. The apparatus of claim 8 , wherein a cut-off discharge voltage of a battery is a voltage at which the battery is considered fully discharged, a nominal voltage of the battery is a typical voltage when the battery works with a usual temperature, and an open-circuit voltage of the battery is a difference of electrical potential between a positive terminal and a negative terminal of the battery.

10. The apparatus of claim 8 , wherein step (e) comprises:

(e1) select one first battery;

(e2) check if the charge unit has been connected with a preset number of third batteries, wherein a current open-circuit voltage of each third battery in the preset number is equal to or more than a cut-off discharge voltage of the third battery;

(e3) send a signal to alert users of the power-driven equipment that the battery unit has low battery charges when the charge unit has not been connected with the preset number of third batteries; and

(e4) switch the connection of the first battery from the discharge unit to the charge unit, and switch a connection of a battery, which is connected to the charge unit and has a highest current open-circuit voltage compared to other batteries connected to the charge unit, from the charge unit to the discharge unit.

11. The apparatus of claim 10 , wherein step (e) further comprises:

(e5) determine if there is any battery in the battery unit that has a current open-circuit voltage higher than the cut-off discharge voltage of the battery;

(e6) continuously provide power to the power-driven equipment by the discharge unit, and return to step (e1), when there is a battery in the battery unit that has a current open-circuit voltage higher than the cut-off discharge voltage of the battery; and

(e7) inform the discharge unit to stop supplying power to the power-driven equipment, when the current open-circuit voltage of each battery in the battery unit is equal to or less than the cut-off discharge voltage of the battery.

12. The apparatus of claim 8 , wherein step (f) comprises:

(f1) select one second battery; and

(f2) switch the connection of the second battery from the charge unit to the discharge unit, and switch a connection of a battery, which is connected to the discharge unit and has a lowest current open-circuit voltage compared to other batteries connected to the discharge unit, from the discharge unit to the charge unit.

13. The apparatus of claim 12 , wherein step (f) further comprises:

(f3) determine if there is any battery in the battery unit that has a current open-circuit voltage lower than the nominal voltage of the battery;

(f4) continuously charge the charge unit by the energy conversion system, and return to step (f1), when there is a battery that has a current open-circuit voltage lower than the nominal voltage of the battery; and

(f5) send a signal to alert the users that the charge unit has completed charging, when the current open-circuit voltage of each battery in the battery unit equals the nominal voltage of the battery.

14. The apparatus of claim 13 , wherein the signal is an audio signal output by a speaker of the apparatus or a message displayed on a display device of the apparatus.

15. A non-transitory computer-readable medium storing a set of instructions, the set of instructions capable of being executed by a microprocessor of an apparatus for controlling charge and discharge of batteries in a battery unit that supplies power to power-driven equipment, the apparatus electrically connected with the battery unit, the power-driven equipment, and an energy conversion system, the method comprising:

(a) setting number requirements of batteries to be connected to a discharge unit and a charge unit of the battery unit, and setting a cut-off discharge voltage and a nominal voltage of each battery, wherein each battery connects to a sensor;

(b) when the power-driven equipment is started, detecting an open-circuit voltage of each battery by the respective sensor connected to the battery;

(c) establishing connections of the batteries with the discharge unit and the charge unit according to the open-circuit voltages of the batteries and the number requirements;

(d) monitoring variations of the open-circuit voltages of the batteries during the discharge unit supplying power to the power-driven equipment and the energy conversion system charging the charge unit;

(e) switching connections of one or more first batteries from the discharge unit to the charge unit, wherein a current open-circuit voltage of each first battery is lower than the cut-off discharge voltage of the first battery; and

(f) switching connections of one or more second batteries from the charge unit to the discharge unit, wherein a current open-circuit voltage of each second battery equals the nominal voltage of the second battery.

16. The medium of claim 15 , wherein a cut-off discharge voltage of a battery is a voltage at which the battery is considered fully discharged, a nominal voltage of the battery is a typical voltage when the battery works with a usual temperature, and an open-circuit voltage of the battery is a difference of electrical potential between a positive terminal and a negative terminal of the battery.

17. The medium of claim 15 , wherein step (e) comprises:

(e1) selecting one first battery;

(e2) checking if the charge unit has been connected with a preset number of third batteries, wherein a current open-circuit voltage of each third battery in the preset number is equal to or more than a cut-off discharge voltage of the third battery;

(e3) sending a signal to alert users of the power-driven equipment that the battery unit has low battery charges if the charge unit has not been connected with the preset number of third batteries; and

(e4) switching the connection of the first battery from the discharge unit to the charge unit, and switching a connection of a battery, which is connected to the charge unit and has a highest current open-circuit voltage compared to other batteries connected to the charge unit, from the charge unit to the discharge unit.

18. The medium of claim 17 , wherein step (e) further comprises:

(e5) determining if there is any battery in the battery unit that has a current open-circuit voltage higher than the cut-off discharge voltage of the battery;

(e6) continuously providing power to the power-driven equipment by the discharge unit, and returning to step (e1), when there is a battery in the battery unit that has a current open-circuit voltage higher than the cut-off discharge voltage of the battery; and

(e7) informing the discharge unit to stop supplying power to the power-driven equipment, when the current open-circuit voltage of each battery in the battery unit is equal to or less than the cut-off discharge voltage of the battery.

19. The medium of claim 15 , wherein step (f) comprises:

(f1) selecting one second battery; and

(f2) switching the connection of the second battery from the charge unit to the discharge unit, and switching a connection of a battery, which is connected to the discharge unit and has a lowest current open-circuit voltage compared to other batteries connected to the discharge unit, from the discharge unit to the charge unit.

20. The medium of claim 19 , wherein step (f) further comprises:

(f3) determining if there is any battery in the battery unit that has a current open-circuit voltage lower than the nominal voltage of the battery;

(f4) continuously charging the charge unit by the energy conversion system, and returning to step (f1), when there is a battery that has a current open-circuit voltage lower than the nominal voltage of the battery; and

(f5) sending a signal to alert the users that the charge unit has completed charging, when the current open-circuit voltage of each battery in the battery unit equals the nominal voltage of the battery.