Battery management method, battery device, and vehicle comprising battery device

A battery device, comprising:

• at least one battery pack including a plurality of battery cells connected in series;
• and
• a battery management system (BMS) configured to:
• receive a state of charge (SOC) setting range,
• estimate, via a micro-controller unit (MCU) of the BMS, a SOC of the at least one battery pack based on state information of the at least one battery pack, and
• charge the at least one battery pack so that the estimated SOC reaches up to a charging reference value corresponding to an upper limit of the SOC setting range,
• wherein the SOC setting range is determined based on driving information of a vehicle, and is within a SOC limiting range, wherein the SOC limiting range is predetermined to cause a lowest degree of degradation of battery cells of the at least one battery pack,
• wherein the estimating the SOC includes:
• estimating a first SOC, via a main estimator, using a first battery modeling method;
• and
• estimating a second SOC, via an auxiliary estimator, using a second battery modeling method,
• wherein the first battery modeling method estimates the first SOC of a current step based on information included in a SOC and state information of the at least one battery pack estimated in an immediately previous step by using an electrical circuit model, and
• wherein the second battery modeling method uses an electrochemical model based on a chemical reaction occurring inside the at least one battery pack.

A vehicle comprising a battery device including:

• at least one battery pack including a plurality of battery cells connected in series;
• a battery management system (BMS) configured to:
• receive a state of charge (SOC) setting range,
• estimate, via a micro-controller unit (MCU) of the BMS, a SOC of the at least one battery pack based on state information of the at least one battery pack, and
• charge the at least one battery pack until the estimated SOC reaches up to a charging reference value corresponding to an upper limit of the SOC setting range;
• and
• a power converting circuit that converts power from the battery device, and supplies power to an electrical load,
• wherein the SOC setting range is determined based on driving information of a vehicle, and is within a SOC limiting range, wherein the SOC limiting range is predetermined to cause a lowest degree of degradation of battery cells of the at least one battery pack,
• wherein the estimating the SOC includes:
• estimating a first SOC, via a main estimator, using a first battery modeling method;
• and
• estimating a second SOC, via an auxiliary estimator, using a second battery modeling method,
• wherein the first battery modeling method estimates the first SOC of a current step based on information included in a SOC and state information of the at least one battery pack estimated in an immediately previous step by using an electrical circuit model, and
• wherein the second battery modeling method uses an electrochemical model based on a chemical reaction occurring inside the at least one battery pack.