Battery system and controlling method thereof

A controlling method of a battery system comprising a first battery pack that comprises a first battery cell and a second battery pack that comprises a second battery cell, the controlling method comprising:

• sequentially performing constant current (CC) charging on the second battery pack and the first battery pack based on input power being identified;
• and
• sequentially performing constant voltage (CV) charging on the second battery pack and the first battery pack based on the CC charging of the second battery pack and the first battery pack being completed,
• wherein a discharging performance of the first battery pack is greater than a discharging performance of the second battery pack, and
• wherein a charging performance of the second battery pack is greater than a charging performance of the first battery pack,
• wherein the battery system further comprises:
• a first DC/DC converter, for a first load, connected to the first battery pack;
• a second DC/DC converter, for a second load, connected to the second battery pack;
• a power supplier;
• a first switching element connected between the power supplier and the charger;
• a first resistance connected to a first terminal of the first DC/DC converter;
• a second switching element connected to the first resistance;
• a third switching element connected between the first terminal of the first DC/DC converter and the charger;
• a fourth switching element connected between a first terminal of the second DC/DC converter and the charger;
• a second resistance connected to a first terminal of the first switching element between the third switching element and the fourth switching element;
• a third resistance connected to the first terminal of the second DC/DC converter;
• and
• a fifth switching element connected to the third resistance.

A non-transitory computer-readable medium storing computer instructions that, when executed by a processor of a battery system comprising a first battery pack that comprises a first battery cell and a second battery pack that comprises a second battery cell, causes the battery system to operate, wherein the operation comprises:

• sequentially performing constant current (CC) charging on the second battery pack and the first battery pack based on input power being identified;
• and
• sequentially performing constant voltage (CV) charging on the first battery pack and the second battery pack based on the CC charging of the second battery pack and the first battery pack being completed,
• wherein a discharging performance of the first battery pack is greater than a discharging performance of the second battery pack, and wherein a charging performance of the second battery pack is greater than a charging performance of the first battery pack, and
• wherein the battery system further comprises:
• a first DC/DC converter, for a first load, connected to the first battery pack;
• a second DC/DC converter, for a second load, connected to the second battery pack;
• a power supplier;
• a first switching element connected between the power supplier and the charger;
• a first resistance connected to a first terminal of the first DC/DC converter;
• a second switching element connected to the first resistance;
• a third switching element connected between the first terminal of the first DC/DC converter and the charger;
• a fourth switching element connected between a first terminal of the second DC/DC converter and the charger;
• a second resistance connected to a first terminal of the first switching element between the third switching element and the fourth switching element;
• a third resistance connected to the first terminal of the second DC/DC converter;
• and
• a fifth switching element connected to the third resistance.