Battery charging method and apparatus

1. A battery charging method, comprising:

operating in a first charging mode including plural charging steps, wherein it is determined whether a condition is satisfied in each of the plural charging steps, the condition comprising a first condition in which a battery overpotential of a battery is greater than or equal to a threshold voltage;

charging the battery in a first charging step of the plural charging steps, wherein charging current in the first charging step is constant charging current;

changing from the first charging step to a second charging step of the plural charging steps, in response to the first condition being satisfied in the first charging step; and

charging the battery in the second charging step, wherein charging current in the second charging step is constant charging current,

wherein the battery is continually charged without rest time in the plural charging steps, during the operating in the first charging mode, and

wherein the battery is charged in a second charging mode before the operating in the first charging mode, a charging current in the first charging mode being greater than a charging current in the second charging mode.

2. The battery charging method of claim 1 , wherein an intensity of a charging current in the second charging step is less than an intensity of a charging current in the first charging step.

3. The battery charging method of claim 1 , further comprising selecting the first charging step from a plurality of first charging steps based on a measured voltage of the battery.

4. The battery charging method of claim 1 , further comprising:

measuring a voltage of the battery before the charging of the battery in the first charging step; and

selecting the first charging step from a plurality of first charging steps in response to the measured voltage being greater than a voltage corresponding to the first charging step, and the measured voltage being less than a voltage corresponding to the second charging step.

5. The battery charging method of claim 1 , wherein the battery overpotential is determined based on a difference between a voltage value of the battery and a reference voltage value.

6. The battery charging method of claim 1 , wherein the condition further comprises a second condition in which a charging time of the battery in the first charging step is greater than or equal to a duration of the first charging step.

7. The battery charging method of claim 1 , wherein the condition further comprises a third condition in which a voltage of the battery in the first charging step is greater than or equal to a voltage corresponding to the first charging step.

8. A battery charging method, comprising:

operating in a first charging mode including plural charging steps, wherein it is determined whether a condition is satisfied in each of the plural charging steps, the condition comprising a first condition in which a battery overpotential of a battery is greater than or equal to a threshold voltage;

charging the battery in a first charging step of the plural charging steps, wherein charging current in the first charging step is constant charging current;

changing from the first charging step to a second charging step of the plural charging steps, in response to the first condition being satisfied in the first charging step; and

charging the battery in the second charging step, wherein charging current in the second charging step is constant charging current,

wherein a voltage of the battery is monitored during the plural charging steps, and

wherein the battery is charged in a second charging mode before the operating in the first charging mode, a charging current in the first charging mode being greater than a charging current in the second charging mode.

9. The battery charging method of claim 8 , wherein an intensity of a charging current in the second charging step is less than an intensity of a charging current in the first charging step.

10. The battery charging method of claim 8 , further comprising selecting the first charging step from a plurality of first charging steps based on a voltage which is measured before the charging of the battery in the first charging step.

11. The battery charging method of claim 8 , further comprising:

measuring a voltage of the battery before the charging of the battery in the first charging step; and

selecting the first charging step from a plurality of first charging steps in response to the measured voltage being greater than a voltage corresponding to the first charging step, and the measured voltage being less than a voltage corresponding to the second charging step.

12. The battery charging method of claim 8 , wherein the battery overpotential is determined based on a difference between a voltage value of the battery and a reference voltage value.

13. The battery charging method of claim 8 , wherein the condition further comprises a second condition in which a charging time of the battery in the first charging step is greater than or equal to a duration of the first charging step.

14. The battery charging method of claim 8 , wherein the condition further comprises a third condition in which a voltage of the battery in the first charging step is greater than or equal to a voltage corresponding to the first charging step.

15. A battery charging apparatus comprising:

a memory configured to store one or more instructions; and

a processor coupled to the memory,

wherein, when executing the one or more instructions, the processor is configured to:

operate in a first charging mode including plural charging steps, wherein it is determined whether a condition is satisfied in each of the plural charging steps, the condition comprising a first condition in which a battery overpotential of a battery is greater than or equal to a threshold voltage,

charge the battery in a first charging step of plural charging steps, wherein charging current in the first charging step is constant charging current,

change from the first charging step to a second charging step of the plural charging steps, in response to the first condition being satisfied in the first charging step, and

charge the battery in the second charging step, wherein charging current in the second charging step is constant charging current,

wherein the battery is continually charged without rest time in the plural charging steps, during the operation in the first charging mode, and

wherein the batter is charged in a second charging mode before the operating in the first charging mode, a charging current in the first charging mode being greater than a charging current in the second charging mode.

16. The battery charging apparatus of claim 15 , wherein an intensity of a charging current in the second charging step is less than an intensity of a charging current in the first charging step.

17. The battery charging apparatus of claim 15 , wherein the processor is further configured to select the first charging step from a plurality of first charging steps based on a measured voltage of the battery.

18. The battery charging apparatus of claim 15 , wherein the processor is further configured to:

measure a voltage of the battery before the charging of the battery in the first charging step, and

select the first charging step from a plurality of first charging steps in response to the measured voltage being greater than a voltage corresponding to the first charging step, and the measured voltage being less than a voltage corresponding to the second charging step.

19. The battery charging apparatus of claim 15 , wherein a voltage of the battery is monitored during either one or both of the first charging step and the second charging step.