公开(公告)号：EP3889626A1

公开(公告)日：2021-10-06

申请号：EP21156794.6

申请日：2021-02-12

申请人： O2Micro, Inc.

发明人： Chou, Chih-Chung ,  Li, Guoxing ,  Wang, Hua-Yi ,  Hsieh, Fu-Jen ,  Chen, Lian

IPC分类号： G01R31/3842 ,  G01R31/367 ,  G01R31/392

摘要： In a battery management controller, analog-to-digital conversion circuitry converts analog signals, indicative of a battery voltage, a battery current, and a battery temperature, to digital signals. A memory stores a remaining-capacity lookup table that includes multiple groups of data. Each group of data includes a voltage, a current, a temperature, and a parameter associated with a remaining capacity corresponding to the voltage, the current and the temperature. A processor searches the lookup table for a current parameter value and an end-of-discharge parameter value based on the digital signals, and estimates a full available charge capacity of the battery based on the current parameter value and the end-of-discharge parameter value. The processor also counts the amount of charges flowing through the battery based on a battery current. The processor further estimates an available state of charge of the battery according to the full available charge capacity and the amount of charges.