Energy storage battery charge and health state online estimation method based on least square method

• Main Authors: YUAN CHAOYONG, LIU GANG, LI ZHENGSHUO, YAN XUEQING, QIAN JUN
• Format: Patent
• Language: Chinese; English
• Published: 25.11.2022
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention discloses an energy storage battery charge and health state online estimation method based on a least square method. The method comprises the following steps: modeling an internal structure of an energy storage battery into a second-order circuit model according to internal characteristics of the energy storage battery; a least square method is adopted, historical data are used for identifying parameters in a second-order circuit model in the energy storage battery, and on the premise of a certain error, a charging and discharging simulation curve which most meets port circuit characteristics is obtained; and then SOC and SOH state estimation is realized based on a charge and discharge simulation curve by establishing SOC and SOH estimation formulas. According to the method, the charge state change of the battery in the charging and discharging process of the battery is accurately estimated online, a dispatcher can clearly issue a dispatching instruction according to the current state of the bat