System and method of managing battery by using balancing battery

1. A system for managing a battery, the system comprising:

a battery unit including a plurality of battery modules, wherein the plurality of battery modules are configured to provide electric energy to an electronic device;

a balancing battery electrically coupled to the battery unit;

a cooling fan configured to adjust a flow rate of a fluid flowing into the battery unit, wherein the balancing battery is configured to supply electric energy to the cooling fan; and

a fan control circuit configured to control operation of the cooling fan, and to control the supply of electric energy from the balancing battery to the cooling fan,

wherein the balancing battery is further configured to perform balancing of the plurality of battery modules included in the battery unit by:

supplying electric energy to one or more of the plurality of battery modules and charging the one or more battery modules; and

receiving electric energy from one or more of the plurality of battery modules.

2. The system of claim 1 , wherein the cooling fan is provided in each of the plurality of battery modules.

3. The system of claim 2 , wherein the fan control circuit operates a cooling fan corresponding to a battery module, of which at least one of a temperature and a discharged current quantity is equal to or larger than a threshold value, among the plurality of battery modules.

4. The system of claim 1 , wherein when a residual power quantity of the balancing battery is equal to or larger than a first threshold value, the fan control circuit operates the cooling fan.

5. The system of claim 4 , wherein the fan control circuit operates the cooling fan until the residual power quantity of the balancing battery is equal to or smaller than a second threshold value.

6. A method of managing a battery, the method comprising:

a monitoring operation of monitoring a state of a plurality of battery modules included in a battery unit, wherein the plurality of battery modules are configured to provide electric energy to an electronic device;

a balancing operation of adjusting a voltage of the plurality of battery modules, the balancing operation performed by a balancing battery electrically coupled to the battery unit by:

supplying electric energy stored in the balancing battery to at least one of the plurality of battery modules; and

the balancing battery receiving electric energy from at least one of the plurality of battery modules,

based on the monitored state of the battery modules; and

a cooling fan controlling operation of supplying electric energy from the balancing battery to a cooling fan to adjust a flow rate of a fluid flowing into at least one of the plurality of battery modules based on the monitored state of the battery module.

7. The method of claim 6 , wherein the cooling fan controlling operation includes:

selecting one or more cooling fans among the cooling fans installed in the plurality of battery modules, respectively, based on the monitored state of the battery modules; and

supplying, by the balancing battery, electric energy to the selected one or more cooling fans.

8. The method of claim 7 , wherein the selecting of the one or more cooling fans among the cooling fans includes selecting a cooling fan corresponding to a battery module, of which at least one of a temperature and a discharged current quantity is equal to or larger than a threshold value, among the plurality of battery modules.

9. The method of claim 6 , wherein the cooling fan controlling operation further includes:

determining whether a residual power quantity of the balancing battery is equal to or larger than a first threshold value; and

when the residual power quantity of the balancing battery is equal to or larger than the first threshold value, operating the cooling fan.

10. The method of claim 9 , wherein the operating of the cooling fan includes:

determining whether the residual power quantity of the balancing battery is equal to or smaller than a second threshold value; and

operating the cooling fan until the residual power quantity of the balancing battery is equal to or smaller than the second threshold value.

11. The system of claim 1 , wherein when a voltage of one of the plurality of battery modules exceeds a first predetermined voltage value, the balancing battery is configured to receive electric energy from said one of the plurality of battery modules.

12. The system of claim 1 , wherein when a voltage of one of the plurality of battery modules is less than a second predetermined voltage value, the balancing battery is configured to supply electric energy to said one of the plurality of battery modules.

13. The system of claim 1 , wherein when a residual power quantity of the balancing battery is equal to or larger than a first threshold value, the balancing battery is configured to supply electric energy to the cooling fan.

14. The system of claim 1 , wherein the balancing battery is the only battery of the system configured to supply electric energy to one or more of the plurality of battery modules and receive electric energy from one or more of the plurality of battery modules.

15. The system of claim 1 , wherein the balancing battery is the only battery of the system configured to supply electric energy to the cooling fan.