Charging/discharging current estimation device

A current estimation device for estimating a charging/discharging current of a battery pack, the current estimation device comprising:

• a shunt resistor connected between a first node and a second node on a charging/discharging path of the battery pack;
• a shunt capacitor connected between the first node and the second node;
• a voltage measuring unit connected between the first node and the second node to measure a voltage applied to the shunt resistor;
• and
• a current estimating unit configured to estimate the charging/discharging current of the battery pack by using the voltage measured by the voltage measuring unit,
• wherein the voltage measuring unit comprises:
• a filter module;
• and an amplification module,
• wherein the filter module comprises:
• a first series arm comprising a first resistor and a first capacitor connected to the first resistor in series, and connected to the first node;
• and
• a second series arm comprising a second resistor and a second capacitor connected to the second resistor in series, and connected to the second node, and
• the amplification module comprises:
• an amplifier comprising an input terminal connected to a third node formed between the first resistor and the first capacitor, and an input terminal connected to a fourth node formed between the second resistor and the second capacitor,
• wherein the current estimation device further comprises:
• a first switch connected between the first capacitor and the third node;
• a second switch connected between the second capacitor and the fourth node;
• and
• a switching control unit configured to individually control an operation of the first switch and an operation of the second switch,
• wherein the current estimating unit is configured to output a notification signal corresponding to a magnitude of the estimated charging/discharging current to the switching control unit, and
• the switching control unit is configured to individually control the operations of the first switch and second switch based on the notification signal.