Apparatus and control method for battery management system
An embodiment of the present invention is directed to providing an apparatus and a control method for a battery management system (BMS) that may operate in an optimal charging temperature range to suppress deterioration of battery cells during rapid charging of a secondary battery that requires a high charging current.
1. An apparatus for a battery management system (BMS) comprising:
a measuring unit measuring or estimating a temperature, a state of charge (SOC), a voltage, and a charging current of a battery;
a first calculating unit calculating a temperature change amount for each charge amount of the temperature of the battery with respect to the SOC or the voltage of the battery, based on the temperature, the SOC, and the voltage of the battery measured at different time points by the measuring unit;
a second calculating unit calculating an expected temperature of the battery when the SOC of the battery is charged with a first reference value, based on the temperature, the SOC, and the temperature change amount for each charge amount of the battery; and
a control unit controlling a first charging current based on information obtained by comparing the expected temperature calculated by the second calculating unit and a predetermined first reference temperature, and charging the battery with the first charging current.
2. The apparatus for a BMS of claim 1 , wherein the control unit increases the first charging current when the expected temperature is the first reference temperature or less, and decreases the first charging current when the expected temperature is the first reference temperature or more.
3. The apparatus for a BMS of claim 2 , wherein the first calculating unit calculates the temperature change amount for each charge amount based on a first SOC, a second SOC, a first temperature, and a second temperature,
the first SOC is the SOC of the battery measured at a first time point, and the second SOC is the SOC of the battery measured at a second time point different from the first time point, and
the first temperature is the temperature of the battery measured at the first time point, and the second temperature is the temperature of the battery measured at the second time point.
4. The apparatus for a BMS of claim 2 , wherein the control unit charges the battery with a second charging current that is the first charging current or less as the charging current of the battery, when the temperature of the battery measured by the measuring unit exceeds the first reference temperature.
5. The apparatus for a BMS of claim 2 , wherein the control unit charges the battery with a third charging current different from the first charging current as the charging current of the battery, when the SOC of the battery measured by the measuring unit exceeds the first reference value.
6. A control method for an apparatus for a battery management system (BMS) comprising:
a measuring step of measuring or estimating a temperature, a state of charge (SOC), a voltage, and a charging current of a battery;
a first calculating step of calculating a temperature change amount for each charge amount of the temperature of the battery with respect to the SOC or the voltage of the battery, based on the temperature, the SOC, and the voltage of the battery measured at different time points in the measuring step;
a second calculating step of calculating an expected temperature of the battery when the SOC of the battery is charged with a first reference value, based on the temperature, the SOC, and the temperature change amount for each charge amount of the battery; and
a controlling step of controlling a first charging current based on information obtained by comparing the expected temperature calculated in the second calculating step and a predetermined first reference temperature, and charging the battery with the first charging current.
7. The control method for an apparatus for a BMS of claim 6 , wherein in the controlling step, the first charging current is increased when the expected temperature is the first reference temperature or less, and the first charging current is decreased when the expected temperature is the first reference temperature or more.
8. The control method for an apparatus for a BMS of claim 7 , wherein in the first calculating step, the temperature change amount for each charge amount is calculated based on a first SOC, a second SOC, a first temperature, and a second temperature,
the first SOC is the SOC of the battery measured at a first time point, and the second SOC is the SOC of the battery measured at a second time point different from the first time point, and
the first temperature is the temperature of the battery measured at the first time point, and the second temperature is the temperature of the battery measured at the second time point.
9. The control method for an apparatus for a BMS of claim 7 , wherein in the controlling step, the battery is charged with a second charging current that is the first charging current or less as the charging current of the battery, when the temperature of the battery measured in the measuring step exceeds the first reference temperature.
10. The control method for an apparatus for a BMS of claim 7 , wherein in the controlling step, the battery is charged with a third charging current different from the first charging current as the charging current of the battery, when the SOC of the battery measured in the measuring step exceeds the first reference value.