Method for charging battery and electronic device applying the method

A method of charging a battery of an electronic device, the method comprising:

• performing charging in a first mode in which first charging current is uniformly maintained in a first interval having a first target voltage;
• identifying whether a state of charge (SoC) of the battery reaches a first charging state value;
• obtaining a first value that is a charging current flowing into the battery and a second value that is an average value of the charging current flowing into the battery for a specified time;
• identifying whether a greater value of the first value and the second value is less than a first reference current value for at least a specified number of times;
• performing charging in a second mode in which the first target voltage is maintained while gradually changing the first charging current to a second charging current;
• performing charging in the first mode by entering a second interval having a second target voltage different from the first target voltage;
• and
• switching the first mode to the second mode when a voltage of the battery reaches the second target voltage.

An electronic device comprising:

• a housing;
• a battery disposed inside the housing;
• a power management module configured to control charging the battery;
• and
• at least one processor operationally connected with the battery and the power management module,
• wherein the at least one processor is configured to:
• set a plurality of target voltages for a plurality of charging intervals, respectively,
• identify whether a voltage of the battery reaches a target voltage in a corresponding charging interval among the plurality of target voltages, while charging the battery in a first mode in which a charging current of the battery is uniformly maintained,
• obtain a first value that is a strength of a current charging current and a second value that is an average value of the charging current for a specified time,
• identify whether a greater value of the first value and the second value is equal to or less than a first reference current value for at least a specified number of times, and
• maintain the target voltage while gradually changing a first charging current to a second charging current that is less than the first charging current to switch the first mode in which the first charging current is uniformly maintained to a second mode in which the target voltage is uniformly maintained, in a first interval of the plurality of charging intervals.