Soc estimating apparatus and method
AssigneeLG Energy Solution, Ltd.
InventorJae-Gu KIM
Life of this patent
Estimating the term…
Abstract
The present disclosure is directed to providing an SOC estimating apparatus and method, which may accurately estimate OCV and SOC of a battery cell even when a voltage rough graph of the battery cell exhibits a nonlinear rough graph. According to an aspect of the present disclosure, the SOC estimating apparatus has an advantage of estimating the SOC of the battery cell more accurately and more reliably. In addition, the SOC estimating apparatus has an advantage of estimating the final SOC of the battery cell quickly even in an environment where it is difficult to secure a sufficient rest period, by estimating the second SOC based on voltage information obtained during the charging and discharging interruption time.
Claims12
A state of charge (SOC) estimating apparatus, comprising:
- a measuring unit configured to:
- measure a current and voltage of a battery cell;
- and
- output the measured current information and the measured voltage information;
- and
- a control unit configured to:
- receive the current information and the voltage information from the measuring unit;
- calculate:
- a charging and discharging time during which the battery cell is charged or discharged;
- and
- a charging and discharging interruption time during which the charging and discharging is interrupted;
- estimate a first SOC of the battery cell according to the current information during the charging and discharging time;
- determine whether or not to estimate a second SOC of the battery cell according to the voltage information, based on a comparison result of the charging and discharging interruption time and a preset reference time;
- estimate a third SOC by performing a weighted summation to the first SOC and the second SOC, based on the charging and discharging interruption time when the second SOC is estimated;
- and
- determine the estimated third SOC as the SOC of the battery cell.
A state of charge (SOC) estimating method, comprising:
- a current and voltage measuring operation of measuring a current and voltage of a battery cell to obtain current information and voltage information;
- a time calculating operation of calculating:
- a charging and discharging time during which the battery cell is charged or discharged, and
- a charging and discharging interruption time during which the charging and discharging is interrupted;
- a first SOC estimating operation of estimating a first SOC of the battery cell according to the current information during the charging and discharging time;
- a second SOC estimating operation of estimating a second SOC of the battery cell according to the voltage information, based on a comparison result of the charging and discharging interruption time and a preset reference time;
- a third SOC estimating operation of estimating a third SOC by performing a weighted summation to the first SOC and the second SOC, based on the charging and discharging interruption time;
- and
- a battery cell SOC estimating operation of determining the estimated third SOC as the SOC of the battery cell.
Dependencies are inferred from the claim text.