SOC real-time estimation method and system

• Main Authors: KAN CONG, YUAN ZHONG, QI MINGZHU, LI MAONAN
• Format: Patent
• Language: Chinese; English
• Published: 10.11.2023
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention provides an SOC real-time estimation method and system, and relates to the technical field of electric automobiles, and the specific scheme comprises the steps: employing an interval sampling method, and updating the reference value of the internal resistance of a battery pack; obtaining current values of voltage and current of the battery pack in real time, and calculating a current value of internal resistance; based on the current value of the internal resistance, battery pack state judgment is performed; according to the state of the battery pack, a final SOC estimated value is obtained from a voltage and SOC corresponding table by using the corrected voltage value; wherein the step of updating the reference value of the internal resistance of the battery pack is as follows: after a system starting interval exceeds a preset time length, sampling for preset times by taking the preset time length as an interval, removing an extreme value, taking a mean value, and taking the mean value as the l